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113 results on '"Minitti, M. P."'

1. Dielectronic satellite emission from a solid-density Mg plasma: relationship to models of ionisation potential depression

Author

Pérez-Callejo, G., Gawne, T., Preston, T. R., Hollebon, P., Humphries, O. S., Chung, H. -K., Dakovski, G. L., Krzywinski, J., Minitti, M. P., Burian, T., Chalupský, J., Hájková, V., Juha, L., Vozda, V., Zastrau, U., Vinko, S. M., Rose, S. J., and Wark, J. S.

Subjects
High Energy Physics - Experiment, Physics - Plasma Physics
Abstract

We report on experiments where solid-density Mg plasmas are created by heating with the focused output of the Linac Coherent Light Source x-ray free-electron-laser. We study the K-shell emission from the Helium and Lithium-like ions using Bragg crystal spectroscopy. Observation of the dielectronic satellites in Lithium-like ions confirms that the M-shell electrons appear bound for these high charge states. An analysis of the intensity of these satellites indicates that when modelled with an atomic-kinetics code, the ionisation potential depression model employed needs to produce depressions for these ions which lie between those predicted by the well known Stewart-Pyatt and Ecker-Kroll models. These results are largely consistent with recent Density Functional Theory calculations.

Published
2023
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2. Enhanced charge density wave coherence in a light-quenched, high-temperature superconductor

Author

Wandel, S., Boschini, F., Neto, E. H. da Silva, Shen, L., Na, M. X., Zohar, S., Wang, Y., Welch, S. B., Seaberg, M. H., Koralek, J. D., Dakovski, G. L., Hettel, W., Lin, M-F., Moeller, S. P., Schlotter, W. F., Reid, A. H., Minitti, M. P., Boyle, T., He, F., Sutarto, R., Liang, R., Bonn, D., Hardy, W., Kaindl, R. A., Hawthorn, D. G., Lee, J. -S., Kemper, A. F., Damascelli, A., Giannetti, C., Turner, J. J., and Coslovich, G.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Strongly Correlated Electrons
Abstract

Superconductivity and charge density waves (CDW) are competitive, yet coexisting orders in cuprate superconductors. To understand their microscopic interdependence, a probe capable of discerning their interaction on its natural length and time scales is necessary. We use ultrafast resonant soft x-ray scattering to track the transient evolution of CDW correlations in YBa$_{2}$Cu$_{3}$O$_{6+x}$ following the quench of superconductivity by an infrared laser pulse. We observe a non-thermal response of the CDW order characterized by a near doubling of the correlation length within $\approx$ 1 picosecond of the superconducting quench. Our results are consistent with a model in which the interaction between superconductivity and CDW manifests inhomogeneously through disruption of spatial coherence, with superconductivity playing the dominant role in stabilizing CDW topological defects, such as discommensurations., Comment: Accepted version. 34 pages, 11 figures, Main text and Supplementary Materials

Published
2020
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3. RIXS Reveals Hidden Local Transitions of the Aqueous OH Radical

Author

Kjellsson, L., Nanda, K., Rubensson, J. -E., Doumy, G., Southworth, S. H., Ho, P. J., March, A. M., Haddad, A. Al, Kumagai, Y., Tu, M. -F., Schaller, R., Debnath, T., Yusof, M. S. Bin Mohd, Arnold, C., Schlotter, W. F., Moeller, S., Coslovich, G., Koralek, J. D., Minitti, M. P., Vidal, M. L., Simon, M., Santra, R., Loh, Z. -H., Coriani, vS., Krylov, A. I., and Young, L.

Subjects
Physics - Chemical Physics
Abstract

Resonant inelastic x-ray scattering (RIXS) provides remarkable opportunities to interrogate ultrafast dynamics in liquids. Here we use RIXS to study the fundamentally and practically important hydroxyl radical in liquid water, OH(aq). Impulsive ionization of pure liquid water produced a short-lived population of OH(aq), which was probed using femtosecond x-rays from an x-ray free-electron laser. We find that RIXS reveals localized electronic transitions that are masked in the ultraviolet absorption spectrum by strong charge-transfer transitions -- thus providing a means to investigate the evolving electronic structure and reactivity of the hydroxyl radical in aqueous and heterogeneous environments. First-principles calculations provide interpretation of the main spectral features., Comment: 40 pages, 10 figures

Published
2020
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4. Preserving orbital order in a layered manganite by ultrafast hybridized band excitation

Author

Shen, L., Mack, S., Dakovski, G., Coslovich, G., Krupin, O., Hoffmann, M., Huang, S-W., Chuang, Y-D., Johnson, J. A., Lieu, S., Zohar, S., Ford, C., Kozina, M., Schlotter, W., Minitti, M. P., Fujioka, J., Moore, R., Lee, W-S., Hussain, Z., Tokura, Y., Littlewood, P., and Turner, J. J.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

In the mixed-valence manganites, a near-infrared laser typically melts the orbital and spin order simultaneously, corresponding to the photoinduced $d^{1}d^{0}$ $\xrightarrow{}$ $d^{0}d^{1}$ excitations in the Mott-Hubbard bands of manganese. Here, we use ultrafast methods -- both femtosecond resonant x-ray diffraction and optical reflectivity -- to demonstrate that the orbital response in the layered manganite Nd$_{1-x}$Sr$_{1+x}$MnO$_{4}$ ($\it{x}$ = 2/3) does not follow this scheme. At the photoexcitation saturation fluence, the orbital order is only diminished by a few percent in the transient state. Instead of the typical $d^{1}d^{0}$ $\xrightarrow{}$ $d^{0}d^{1}$ transition, a near-infrared pump in this compound promotes a fundamentally distinct mechanism of charge transfer, the $d^{0}$ $ \xrightarrow{}$ $d^{1}L$, where $\it{L}$ denotes a hole in the oxygen band. This novel finding may pave a new avenue for selectively manipulating specific types of order in complex materials of this class.

Published
2019
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5. Imaging the Photochemical Ring-Opening of 1,3-Cyclohexadiene by Ultrafast Electron Diffraction

Author

Wolf, T. J. A., Sanchez, D. M., Yang, J., Parrish, R. M., Nunes, J. P. F., Centurion, M., Coffee, R., Cryan, J. P., Gühr, M., Hegazy, K., Kirrander, A., Li, R. K., Ruddock, J., Shen, X., Veccione, T., Weathersby, S. P., Weber, P. M., Wilkin, K., Yong, H., Zheng, Q., Wang, X. J., Minitti, M. P., and Martínez, T. J.

Subjects
Physics - Chemical Physics
Abstract

The ultrafast photoinduced ring-opening of 1,3-cyclohexadiene constitutes a textbook example of electrocyclic reactions in organic chemistry and a model for photobiological reactions in vitamin D synthesis. Here, we present direct and unambiguous observation of the ring-opening reaction path on the femtosecond timescale and sub-{\AA}ngstr\"om length scale by megaelectronvolt ultrafast electron diffraction. We follow the carbon-carbon bond dissociation and the structural opening of the 1,3-cyclohexadiene ring by direct measurement of time-dependent changes in the distribution of interatomic distances. We observe a substantial acceleration of the ring-opening motion after internal conversion to the ground state due to steepening of the electronic potential gradient towards the product minima. The ring-opening motion transforms into rotation of the terminal ethylene groups in the photoproduct 1,3,5-hexatriene on the sub-picosecond timescale. Our work demonstrates the potential of megaelectronvolt ultrafast electron diffraction to elucidate photochemical reaction paths in organic chemistry.

Published
2018
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6. Dielectronic satellite emission from a solid-density Mg plasma: Relationship to models of ionization potential depression

Author

Pérez-Callejo, G., primary, Gawne, T., additional, Preston, T. R., additional, Hollebon, P., additional, Humphries, O. S., additional, Chung, H.-K., additional, Dakovski, G. L., additional, Krzywinski, J., additional, Minitti, M. P., additional, Burian, T., additional, Chalupský, J., additional, Hájková, V., additional, Juha, L., additional, Vozda, V., additional, Zastrau, U., additional, Vinko, S. M., additional, Rose, S. J., additional, and Wark, J. S., additional

Published
2024
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7. Self-referenced coherent diffraction x-ray movie of Angstrom- and femtosecond-scale atomic motion

Author

Glownia, J. M., Natan, A., Cryan, J. P., Hartsock, R., Kozina, M., Minitti, M. P., Nelson, S., Robinson, J., Sato, T., van Driel, T., Welch, G., Weninger, C., Zhi, D., and Bucksbaum, P. H.

Subjects
Physics - Atomic Physics, Quantum Physics
Abstract

Time-resolved femtosecond x-ray diffraction patterns from laser-excited molecular iodine are used to create a movie of intramolecular motion with time and space resolution of $30~$fs and $0.3$ \AA . The high spatial fidelity is due to interference between the moving excitation and the static initial charge distribution. This x-ray interference has not been employed to image internal motion in molecules before. The initial state is used as the local oscillator for heterodyne amplification of the excited charge distribution to retrieve real-space movies of atomic motion on \AA ngstrom and femtosecond scales. Coherent vibrational motion and dispersion, dissociation, and rotational dephasing are all clearly visible in the data, thereby demonstrating the stunning sensitivity of heterodyne methods., Comment: Accepted by Physical Review Letters

Published
2016
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8. Ultrafast Laser-Induced Melting of Long-Range Magnetic Order in Multiferroic TbMnO3

Author

Johnson, Jeremy A., Kubacka, T., Hoffmann, M. C., Vicario, C., de Jong, S., Beaud, P., Gruebel, S., Huang, S. -W., Huber, L., Windsor, Y. W., Bothschafter, E. M., Rettig, L., Ramakrishnan, M., Alberca, A., Patthey, L., Chuang, Y. -D., Turner, J. J., Dakovski, G. L., Lee, W. -S., Minitti, M. P., Schlotter, W., Moore, R. G., Hauri, C. P., Koohpayeh, S. M., Scagnoli, V., Ingold, G., Johnson, S. L., and Staub, U.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

We performed ultrafast time-resolved near-infrared pump, resonant soft X-ray diffraction probe measurements to investigate the coupling between the photoexcited electronic system and the spin cycloid magnetic order in multiferroic TbMnO3 at low temperatures. We observe melting of the long range antiferromagnetic order at low excitation fluences with a decay time constant of 22.3 +- 1.1 ps, which is much slower than the ~1 ps melting times previously observed in other systems. To explain the data we propose a simple model of the melting process where the pump laser pulse directly excites the electronic system, which then leads to an increase in the effective temperature of the spin system via a slower relaxation mechanism. Despite this apparent increase in the effective spin temperature, we do not observe changes in the wavevector q of the antiferromagnetic spin order that would typically correlate with an increase in temperature under equilibrium conditions. We suggest that this behavior results from the extremely low magnon group velocity that hinders a change in the spin-spiral wavevector on these time scales., Comment: 9 pages, 4 figures

Published
2015
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9. Spatially resolved ultrafast magnetic dynamics launched at a complex-oxide hetero-interface

Author

Först, M., Caviglia, A. D., Scherwitzl, R., Mankowsky, R., Zubko, P., Khanna, V., Bromberger, H., Wilkins, S. B., Chuang, Y. -D., Lee, W. S., Schlotter, W. F., Turner, J. J., Dakovski, G. L., Minitti, M. P., Robinson, J., Clark, S. R., Jaksch, D., Triscone, J. -M., Hill, J. P., Dhesi, S. S., and Cavalleri, A.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

Static strain in complex oxide heterostructures has been extensively used to engineer electronic and magnetic properties at equilibrium. In the same spirit, deformations of the crystal lattice with light may be used to achieve functional control across hetero-interfaces dynamically. Here, by exciting large amplitude infrared-active vibrations in a LaAlO3 substrate we induce magnetic order melting in a NdNiO3 film across a hetero-interface. Femtosecond Resonant Soft X-ray Diffraction is used to determine the spatial and temporal evolution of the magnetic disordering. We observe a magnetic melt front that grows from the substrate interface into the film, at a speed that suggests electronically driven propagation. Light control and ultrafast phase front propagation at hetero-interfaces may lead to new opportunities in optomagnetism, for example by driving domain wall motion to transport information across suitably designed devices., Comment: 35 pages, 8 Figures (both incl. Supplement)

Published
2015
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10. Femtosecond x rays link melting of charge-density wave correlations and light-enhanced coherent transport in YBa2Cu3O6.6

Author

Frano, M. Först A., Kaiser, S., Mankowsky, R., Hunt, C. R., Turner, J. J., Dakovski, G. L., Minitti, M. P., Robinson, J., Loew, T., Tacon, M. Le, Keimer, B., Hill, J. P., Cavalleri, A., and Dhesi, S. S.

Subjects
Condensed Matter - Superconductivity
Abstract

We use femtosecond resonant soft x-ray diffraction to measure the optically stimulated ultrafast changes of charge density wave correlations in underdoped YBa2Cu3O6.6. We find that when coherent interlayer transport is enhanced by optical excitation of the apical oxygen distortions, at least 50% of the in-plane charge density wave order is melted. These results indicate that charge ordering and superconductivity may be competing up to the charge ordering transition temperature, with the latter becoming a hidden phase that is accessible only by nonlinear phonon excitation., Comment: 22 pages (including Supplement), 3 figures

Published
2015
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11. Melting of Charge Stripes in Vibrationally Driven La1.875Ba0.125CuO4: Assessing the Respective Roles of Electronic and Lattice Order in Frustrated Superconductors

Author

Först, M., Tobey, R. I., Bromberger, H., Wilkins, S. B., Khanna, V., Caviglia, A. D., Chuang, Y. -D., Lee, W. S., Schlotter, W. F., Turner, J. J., Minitti, M. P., Krupin, O., Xu, Z. J., Wen, J. S., Gu, G. D., Dhesi, S. S., Cavalleri, A., and Hill, J. P.

Subjects
Condensed Matter - Superconductivity
Abstract

We report femtosecond resonant soft X-ray diffraction measurements of the dynamics of the charge order and of the crystal lattice in non-superconducting, stripe-ordered La1.875Ba0.125CuO4. Excitation of the in-plane Cu-O stretching phonon with a mid-infrared pulse has been previously shown to induce a transient superconducting state in the closely related compound La1.675Eu0.2Sr0.125CuO4. In La1.875Ba0.125CuO4, we find that the charge stripe order melts promptly on a sub-picosecond time scale. Surprisingly, the low temperature tetragonal distortion is only weakly reduced, reacting on significantly longer time scales that do not correlate with light-induced superconductivity. This experiment suggests that charge modulations alone, and not the LTT distortion, prevent superconductivity in equilibrium., Comment: 16 pages, 3 figures

Published
2014
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12. Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5

Author

Mankowsky, R., Subedi, A., Först, M., Mariager, S. O., Chollet, M., Lemke, H., Robinson, J., Glownia, J., Minitti, M., Frano, A., Fechner, M., Spaldin, N. A., Loew, T., Keimer, B., Georges, A., and Cavalleri, A.

Subjects
Condensed Matter - Superconductivity
Abstract

THz-frequency optical pulses can resonantly drive selected vibrational modes in solids and deform their crystal structure. In complex oxides, this method has been used to melt electronic orders, drive insulator to metal transitions or induce superconductivity. Strikingly, coherent interlayer transport strongly reminiscent of superconductivity can be transiently induced up to room temperature in YBa2Cu3O6+x. By combining femtosecond X-ray diffraction and ab initio density functional theory calculations, we determine here the crystal structure of this exotic non-equilibrium state. We find that nonlinear lattice excitation in normal-state YBa2Cu3O6+x at 100 K causes a staggered dilation/contraction of the Cu-O2 intra/inter- bilayer distances, accompanied by anisotropic changes in the in-plane O-Cu-O bond buckling. Density functional theory calculations indicate that these motions cause dramatic changes in the electronic structure. Amongst these, the enhancement in the dx2-y2 character of the in-plane electronic structure is likely to favor superconductivity., Comment: 28 pages, including Supplement

Published
2014
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13. A Habitable Fluvio-Lacustrine Environment at Yellowknife Bay, Gale Crater, Mars

Author

Grotzinger, JP, Sumner, DY, Kah, LC, Stack, K, Gupta, S, Edgar, L, Rubin, D, Lewis, K, Schieber, J, Mangold, N, Milliken, R, Conrad, PG, DesMarais, D, Farmer, J, Siebach, K, Calef, F, Hurowitz, J, McLennan, SM, Ming, D, Vaniman, D, Crisp, J, Vasavada, A, Edgett, KS, Malin, M, Blake, D, Gellert, R, Mahaffy, P, Wiens, RC, Maurice, S, Grant, JA, Wilson, S, Anderson, RC, Beegle, L, Arvidson, R, Hallet, B, Sletten, RS, Rice, M, Bell, J, Griffes, J, Ehlmann, B, Anderson, RB, Bristow, TF, Dietrich, WE, Dromart, G, Eigenbrode, J, Fraeman, A, Hardgrove, C, Herkenhoff, K, Jandura, L, Kocurek, G, Lee, S, Leshin, LA, Leveille, R, Limonadi, D, Maki, J, McCloskey, S, Meyer, M, Minitti, M, Newsom, H, Oehler, D, Okon, A, Palucis, M, Parker, T, Rowland, S, Schmidt, M, Squyres, S, Steele, A, Stolper, E, Summons, R, Treiman, A, Williams, R, Yingst, A, Team, MSL Science, Kemppinen, Osku, Bridges, Nathan, Johnson, Jeffrey R, Cremers, David, Godber, Austin, Wadhwa, Meenakshi, Wellington, Danika, McEwan, Ian, Newman, Claire, Richardson, Mark, Charpentier, Antoine, Peret, Laurent, King, Penelope, Blank, Jennifer, Weigle, Gerald, Li, Shuai, Robertson, Kevin, Sun, Vivian, Baker, Michael, Edwards, Christopher, Farley, Kenneth, Miller, Hayden, Newcombe, Megan, Pilorget, Cedric, Brunet, Claude, Hipkin, Victoria, and Léveillé, Richard

Subjects
Bays, Carbon, Exobiology, Extraterrestrial Environment, Geologic Sediments, Hydrogen, Hydrogen-Ion Concentration, Iron, Mars, Nitrogen, Oxidation-Reduction, Oxygen, Phosphorus, Salinity, Sulfur, Water, MSL Science Team, General Science & Technology
Abstract

The Curiosity rover discovered fine-grained sedimentary rocks, which are inferred to represent an ancient lake and preserve evidence of an environment that would have been suited to support a martian biosphere founded on chemolithoautotrophy. This aqueous environment was characterized by neutral pH, low salinity, and variable redox states of both iron and sulfur species. Carbon, hydrogen, oxygen, sulfur, nitrogen, and phosphorus were measured directly as key biogenic elements; by inference, phosphorus is assumed to have been available. The environment probably had a minimum duration of hundreds to tens of thousands of years. These results highlight the biological viability of fluvial-lacustrine environments in the post-Noachian history of Mars.

Published
2014

15. Probing the transition state region in catalytic CO oxidation on Ru

Author

Öström, H., Öberg, H., Xin, H., LaRue, J., Beye, M., Dell'Angela, M., Gladh, J., Ng, M. L., Sellberg, J. A., Kaya, S., Mercurio, G., Nordlund, D., Hantschmann, M., Hieke, F., Kühn, D., Schlotter, W. F., Dakovski, G. L., Turner, J. J., Minitti, M. P., Mitra, A., Moeller, S. P., Föhlisch, A., Wolf, M., Wurth, W., Persson, M., Nørskov, J. K., Abild-Pedersen, F., Ogasawara, H., Pettersson, L. G. M, and Nilsson, A.

Published
2015

16. Large-Amplitude Spin Dynamics Driven by a THz Pulse in Resonance with an Electromagnon

Author

Kubacka, T., Johnson, J. A., Hoffmann, M. C., Vicario, C., de Jong, S., Beaud, P., Grübel, S., Huang, S.-W., Huber, L., Patthey, L., Chuang, Y.-D., Turner, J. J., Dakovski, G. L., Lee, W.-S., Minitti, M. P., Schlotter, W., Moore, R. G., Hauri, C. P., Koohpayeh, S. M., Scagnoli, V., Ingold, G., Johnson, S. L., and Staub, U.

Published
2014

17. Enhanced charge density wave coherence in a light-quenched, high-temperature superconductor

Author

Wandel, S., Boschini, F., da Silva Neto, E. H., Shen, L., Na, M. X., Zohar, S., Wang, Y., Welch, S. B., Seaberg, M. H., Koralek, J. D., Dakovski, G. L., Hettel, W., Lin, M. -F., Moeller, S. P., Schlotter, W. F., Reid, A. H., Minitti, M. P., Boyle, T., He, F., Sutarto, R., Liang, R., Bonn, D., Hardy, W., Kaindl, R. A., Hawthorn, D. G., Lee, J. -S., Kemper, A. F., Damascelli, A., Giannetti, Claudio, Turner, J. J., Coslovich, G., Giannetti C. (ORCID:0000-0003-2664-9492), Wandel, S., Boschini, F., da Silva Neto, E. H., Shen, L., Na, M. X., Zohar, S., Wang, Y., Welch, S. B., Seaberg, M. H., Koralek, J. D., Dakovski, G. L., Hettel, W., Lin, M. -F., Moeller, S. P., Schlotter, W. F., Reid, A. H., Minitti, M. P., Boyle, T., He, F., Sutarto, R., Liang, R., Bonn, D., Hardy, W., Kaindl, R. A., Hawthorn, D. G., Lee, J. -S., Kemper, A. F., Damascelli, A., Giannetti, Claudio, Turner, J. J., Coslovich, G., and Giannetti C. (ORCID:0000-0003-2664-9492)

Abstract

Superconductivity and charge density waves (CDWs) are competitive, yet coexisting, orders in cuprate superconductors. To understand their microscopic interdependence, a probe capable of discerning their interaction on its natural length and time scale is necessary. We use ultrafast resonant soft x-ray scattering to track the transient evolution of CDW correlations in YBa2Cu3O6+x after the quench of superconductivity by an infrared laser pulse. We observe a nonthermal response of the CDW order characterized by a near doubling of the correlation length within ≈1 picosecond of the superconducting quench. Our results are consistent with a model in which the interaction between superconductivity and CDWs manifests inhomogeneously through disruption of spatial coherence, with superconductivity playing the dominant role in stabilizing CDW topological defects, such as discommensurations.

Published
2022

18. Enhanced charge density wave coherence in a light-quenched, high-temperature superconductor

Author

Wandel, S., primary, Boschini, F., additional, da Silva Neto, E. H., additional, Shen, L., additional, Na, M. X., additional, Zohar, S., additional, Wang, Y., additional, Welch, S. B., additional, Seaberg, M. H., additional, Koralek, J. D., additional, Dakovski, G. L., additional, Hettel, W., additional, Lin, M.-F., additional, Moeller, S. P., additional, Schlotter, W. F., additional, Reid, A. H., additional, Minitti, M. P., additional, Boyle, T., additional, He, F., additional, Sutarto, R., additional, Liang, R., additional, Bonn, D., additional, Hardy, W., additional, Kaindl, R. A., additional, Hawthorn, D. G., additional, Lee, J.-S., additional, Kemper, A. F., additional, Damascelli, A., additional, Giannetti, C., additional, Turner, J. J., additional, and Coslovich, G., additional

Published
2022
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19. SURFACE CHEMISTRY: Probing the transition state region in catalytic CO oxidation on Ru

Author

Öström, H., Öberg, H., Xin, H., LaRue, J., Beye, M., DellʼAngela, M., Gladh, J., Ng, M. L., Sellberg, J. A., Kaya, S., Mercurio, G., Nordlund, D., Hantschmann, M., Hieke, F., Kühn, D., Schlotter, W. F., Dakovski, G. L., Turner, J. J., Minitti, M. P., Mitra, A., Moeller, S. P., Föhlisch, A., Wolf, M., Wurth, W., Persson, M., Nørskov, J. K., Abild-Pedersen, F., Ogasawara, H., Pettersson, L. G. M, and Nilsson, A.

Published
2015
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20. Resonant Inelastic X-Ray Scattering Reveals Hidden Local Transitions of the Aqueous OH Radical

Author

Kjellsson, Ludvig, Nanda, K. D., Rubensson, Jan-Erik, Doumy, G., Southworth, S. H., Ho, P. J., March, A. M., Al Haddad, A., Kumagai, Y., Tu, M-F, Schaller, R. D., Debnath, T., Yusof, M. S. Bin Mohd, Arnold, C., Schlotter, W. F., Moeller, S., Coslovich, G., Koralek, J. D., Minitti, M. P., Vidal, M. L., Simon, M., Santra, R., Loh, Z-H, Coriani, S., Krylov, A. , I, Young, L., Kjellsson, Ludvig, Nanda, K. D., Rubensson, Jan-Erik, Doumy, G., Southworth, S. H., Ho, P. J., March, A. M., Al Haddad, A., Kumagai, Y., Tu, M-F, Schaller, R. D., Debnath, T., Yusof, M. S. Bin Mohd, Arnold, C., Schlotter, W. F., Moeller, S., Coslovich, G., Koralek, J. D., Minitti, M. P., Vidal, M. L., Simon, M., Santra, R., Loh, Z-H, Coriani, S., Krylov, A. , I, and Young, L.

Abstract

Resonant inelastic x-ray scattering (RIXS) provides remarkable opportunities to interrogate ultra-fast dynamics in liquids. Here we use RIXS to study the fundamentally and practically important hydroxyl radical in liquid water, OH(aq). Impulsive ionization of pure liquid water produced a short-lived population of OH(aq), which was probed using femtosecond x-rays from an x-ray free-electron laser. We find that RIXS reveals localized electronic transitions that are masked in the ultraviolet absorption spectrum by strong charge-transfer transitions-thus providing a means to investigate the evolving electronic structure and reactivity of the hydroxyl radical in aqueous and heterogeneous environments. First-principles calculations provide interpretation of the main spectral features.

Published
2020
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21. Observation of the fastest chemical processes in the radiolysis of water

Author

Loh, Z-H, Doumy, G., Arnold, C., Kjellsson, Ludvig, Southworth, S. H., Al Haddad, A., Kumagai, Y., Tu, M-F, Ho, P. J., March, A. M., Schaller, R. D., Yusof, M. S. Bin Mohd, Debnath, T., Simon, M., Welsch, R., Inhester, L., Khalili, K., Nanda, K., Krylov, A. , I, Moeller, S., Coslovich, G., Koralek, J., Minitti, M. P., Schlotter, W. F., Rubensson, Jan-Erik, Santra, R., Young, L., Loh, Z-H, Doumy, G., Arnold, C., Kjellsson, Ludvig, Southworth, S. H., Al Haddad, A., Kumagai, Y., Tu, M-F, Ho, P. J., March, A. M., Schaller, R. D., Yusof, M. S. Bin Mohd, Debnath, T., Simon, M., Welsch, R., Inhester, L., Khalili, K., Nanda, K., Krylov, A. , I, Moeller, S., Coslovich, G., Koralek, J., Minitti, M. P., Schlotter, W. F., Rubensson, Jan-Erik, Santra, R., and Young, L.

Abstract

Elementary processes associated with ionization of liquid water provide a framework for understanding radiation-matter interactions in chemistry and biology. Although numerous studies have been conducted on the dynamics of the hydrated electron, its partner arising from ionization of liquid water, H2O+, remains elusive. We used tunable femtosecond soft x-ray pulses from an x-ray free electron laser to reveal the dynamics of the valence hole created by strong-field ionization and to track the primary proton transfer reaction giving rise to the formation of OH. The isolated resonance associated with the valence hole (H2O+/OH) enabled straightforward detection. Molecular dynamics simulations revealed that the x-ray spectra are sensitive to structural dynamics at the ionization site. We found signatures of hydrated-electron dynamics in the x-ray spectrum.

Published
2020
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22. Resonant Inelastic X-Ray Scattering Reveals Hidden Local Transitions of the Aqueous OH Radical

Author

Kjellsson, L, Nanda, K D, Rubensson, J-E, Doumy, G, Southworth, S H, Ho, P J, March, A M, Al Haddad, A, Kumagai, Y, Tu, M-F, Schaller, R D, Debnath, T, Bin Mohd Yusof, M S, Arnold, C, Schlotter, W F, Moeller, S, Coslovich, G, Koralek, J D, Minitti, M P, Vidal, Marta Lopez, Simon, M, Santra, R, Loh, Z-H, Coriani, Sonia, Krylov, A I, Young, L, Kjellsson, L, Nanda, K D, Rubensson, J-E, Doumy, G, Southworth, S H, Ho, P J, March, A M, Al Haddad, A, Kumagai, Y, Tu, M-F, Schaller, R D, Debnath, T, Bin Mohd Yusof, M S, Arnold, C, Schlotter, W F, Moeller, S, Coslovich, G, Koralek, J D, Minitti, M P, Vidal, Marta Lopez, Simon, M, Santra, R, Loh, Z-H, Coriani, Sonia, Krylov, A I, and Young, L

Abstract

Resonant inelastic x-ray scattering (RIXS) provides remarkable opportunities to interrogate ultrafast dynamics in liquids. Here we use RIXS to study the fundamentally and practically important hydroxyl radical in liquid water, OH(aq). Impulsive ionization of pure liquid water produced a short-lived population of OH(aq), which was probed using femtosecond x-rays from an x-ray free-electron laser. We find that RIXS reveals localized electronic transitions that are masked in the ultraviolet absorption spectrum by strong charge-transfer transitions-thus providing a means to investigate the evolving electronic structure and reactivity of the hydroxyl radical in aqueous and heterogeneous environments. First-principles calculations provide interpretation of the main spectral features.

Published
2020

23. Resonant Inelastic X-Ray Scattering Reveals Hidden Local Transitions of the Aqueous OH Radical

Author

Kjellsson, L., primary, Nanda, K. D., additional, Rubensson, J.-E., additional, Doumy, G., additional, Southworth, S. H., additional, Ho, P. J., additional, March, A. M., additional, Al Haddad, A., additional, Kumagai, Y., additional, Tu, M.-F., additional, Schaller, R. D., additional, Debnath, T., additional, Bin Mohd Yusof, M. S., additional, Arnold, C., additional, Schlotter, W. F., additional, Moeller, S., additional, Coslovich, G., additional, Koralek, J. D., additional, Minitti, M. P., additional, Vidal, M. L., additional, Simon, M., additional, Santra, R., additional, Loh, Z.-H., additional, Coriani, S., additional, Krylov, A. I., additional, and Young, L., additional

Published
2020
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24. Decoupling spin-orbital correlations in a layered manganite amidst ultrafast hybridized charge-transfer band excitation

Author

Shen, L., primary, Mack, S. A., additional, Dakovski, G., additional, Coslovich, G., additional, Krupin, O., additional, Hoffmann, M., additional, Huang, S.-W., additional, Chuang, Y-D., additional, Johnson, J. A., additional, Lieu, S., additional, Zohar, S., additional, Ford, C., additional, Kozina, M., additional, Schlotter, W., additional, Minitti, M. P., additional, Fujioka, J., additional, Moore, R., additional, Lee, W-S., additional, Hussain, Z., additional, Tokura, Y., additional, Littlewood, P., additional, and Turner, J. J., additional

Published
2020
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25. Observation of the fastest chemical processes in the radiolysis of water

Author

Loh, Z.-H., primary, Doumy, G., additional, Arnold, C., additional, Kjellsson, L., additional, Southworth, S. H., additional, Al Haddad, A., additional, Kumagai, Y., additional, Tu, M.-F., additional, Ho, P. J., additional, March, A. M., additional, Schaller, R. D., additional, Bin Mohd Yusof, M. S., additional, Debnath, T., additional, Simon, M., additional, Welsch, R., additional, Inhester, L., additional, Khalili, K., additional, Nanda, K., additional, Krylov, A. I., additional, Moeller, S., additional, Coslovich, G., additional, Koralek, J., additional, Minitti, M. P., additional, Schlotter, W. F., additional, Rubensson, J.-E., additional, Santra, R., additional, and Young, L., additional

Published
2020
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26. Clocking Femtosecond Collisional Dynamics via Resonant X-Ray Spectroscopy

Author

Van den Berg, Q. Y., Vázquez Fernández Tello, Elisa Alejandra, Burian, T., Chalupský, J., Chung, H.-K, Ciricosta, O., Dakovski, G. L., Hájková, V., Hollebon, P., Juha, L., Krzywinski, J., Lee, R.W., Minitti, M. P., Preston, T. R., García de la Varga, Alberto, Vozda, V., Zastrau, U., Wark, J. S., Velarde Mayol, Pedro, Vinko, S. M., Van den Berg, Q. Y., Vázquez Fernández Tello, Elisa Alejandra, Burian, T., Chalupský, J., Chung, H.-K, Ciricosta, O., Dakovski, G. L., Hájková, V., Hollebon, P., Juha, L., Krzywinski, J., Lee, R.W., Minitti, M. P., Preston, T. R., García de la Varga, Alberto, Vozda, V., Zastrau, U., Wark, J. S., Velarde Mayol, Pedro, and Vinko, S. M.

Abstract

Electron-ion collisional dynamics is of fundamental importance in determining plasma transport properties, nonequilibrium plasma evolution, and electron damage in diffraction imaging applications using bright x-ray free-electron lasers (FELs). Here we describe the first experimental measurements of ultrafast electron impact collisional ionization dynamics using resonant core-hole spectroscopy in a solid-density magnesium plasma, created and diagnosed with the Linac Coherent Light Source x-ray FEL. By resonantly pumping the 1s→2p transition in highly charged ions within an optically thin plasma, we have measured how off-resonance charge states are populated via collisional processes on femtosecond time scales. We present a collisional cross section model that matches our results and demonstrates how the cross sections are enhanced by dense-plasma effects including continuum lowering. Nonlocal thermodynamic equilibrium collisional radiative simulations show excellent agreement with the experimental results and provide new insight on collisional ionization and three-body-recombination processes in the dense-plasma regime.

Published
2018

27. Clocking Femtosecond Collisional Dynamics via Resonant X-Ray Spectroscopy

Author

van den Berg, Q. Y., primary, Fernandez-Tello, E. V., additional, Burian, T., additional, Chalupský, J., additional, Chung, H.-K, additional, Ciricosta, O., additional, Dakovski, G. L., additional, Hájková, V., additional, Hollebon, P., additional, Juha, L., additional, Krzywinski, J., additional, Lee, R. W., additional, Minitti, M. P., additional, Preston, T. R., additional, de la Varga, A. G., additional, Vozda, V., additional, Zastrau, U., additional, Wark, J. S., additional, Velarde, P., additional, and Vinko, S. M., additional

Published
2018
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28. Probing Charge Density Wave Dynamics in Superconducting YBCO via Ultrafast X-Ray Scattering

Author

Wandel, S., primary, Boschini, F., additional, da Silva Neto, E. H., additional, Welch, G. B., additional, Seaberg, M. H., additional, Koralek, J. D., additional, Dakovski, G. L., additional, Hettel, W., additional, Lin, M-F., additional, Moeller, S. P., additional, Coffee, R., additional, Kaindl, R.A., additional, Liang, R., additional, Bonn, D., additional, Hardy, W., additional, Minitti, M. P., additional, Hawthorn, D. G., additional, Damascelli, A., additional, Giannetti, C., additional, Turner, J. J., additional, and Coslovich, G., additional

Published
2018
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29. Real-Time Elucidation of Catalytic Pathways in CO Hydrogenation on Ru

Author

LaRue, Jerry, Krejčí, O., Yu, L., Beye, M., Ng, M. L., Öberg, H., Xin, H., Mercurio, G., Moeller, S., Turner, J. J., Nordlund, D., Coffee, R., Minitti, M. P., Wurth, W., Pettersson, Lars G. M., Öström, Henrik, Nilsson, Anders, Abild-Pedersen, F., Ogasawara, H., LaRue, Jerry, Krejčí, O., Yu, L., Beye, M., Ng, M. L., Öberg, H., Xin, H., Mercurio, G., Moeller, S., Turner, J. J., Nordlund, D., Coffee, R., Minitti, M. P., Wurth, W., Pettersson, Lars G. M., Öström, Henrik, Nilsson, Anders, Abild-Pedersen, F., and Ogasawara, H.

Abstract

The direct elucidation of the reaction pathways in heterogeneous catalysis has been challenging due to the short-lived nature of reaction intermediates. Here, we directly measured on ultrafast time scales the initial hydrogenation steps of adsorbed CO on a Ru catalyst surface, which is known as the bottleneck reaction in syngas and CO2 reforming processes. We initiated the hydrogenation of CO with an ultrafast laser temperature jump and probed transient changes in the electronic structure using real-time X-ray spectroscopy. In combination with theoretical simulations, we verified the formation of CHO during CO hydrogenation.

Published
2017
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30. Nonlinear Ultrafast Spin Scattering in the Skyrmion Phase of Cu2OSeO3

Author

Langner, M. C., primary, Roy, S., additional, Huang, S. W., additional, Koralek, J. D., additional, Chuang, Y.-D., additional, Dakovski, G. L., additional, Turner, J. J., additional, Robinson, J. S., additional, Coffee, R. N., additional, Minitti, M. P., additional, Seki, S., additional, Tokura, Y., additional, and Schoenlein, R. W., additional

Published
2017
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31. Glownia et al. Reply

Author

Glownia, J. M., primary, Natan, A., additional, Cryan, J. P., additional, Hartsock, R., additional, Kozina, M., additional, Minitti, M. P., additional, Nelson, S., additional, Robinson, J., additional, Sato, T., additional, van Driel, T., additional, Welch, G., additional, Weninger, C., additional, Zhu, D., additional, and Bucksbaum, P. H., additional

Published
2017
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32. Real-Time Elucidation of Catalytic Pathways in CO Hydrogenation on Ru

Author

LaRue, J., primary, Krejčí, O., additional, Yu, L., additional, Beye, M., additional, Ng, M. L., additional, Öberg, H., additional, Xin, H., additional, Mercurio, G., additional, Moeller, S., additional, Turner, J. J., additional, Nordlund, D., additional, Coffee, R., additional, Minitti, M. P., additional, Wurth, W., additional, Pettersson, L. G. M., additional, Öström, H., additional, Nilsson, A., additional, Abild-Pedersen, F., additional, and Ogasawara, H., additional

Published
2017
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33. Nonequilibrium lattice-driven dynamics of stripes in nickelates using time-resolved x-ray scattering

Author

Lee, W. S., primary, Kung, Y. F., additional, Moritz, B., additional, Coslovich, G., additional, Kaindl, R. A., additional, Chuang, Y. D., additional, Moore, R. G., additional, Lu, D. H., additional, Kirchmann, P. S., additional, Robinson, J. S., additional, Minitti, M. P., additional, Dakovski, G., additional, Schlotter, W. F., additional, Turner, J. J., additional, Gerber, S., additional, Sasagawa, T., additional, Hussain, Z., additional, Shen, Z. X., additional, and Devereaux, T. P., additional

Published
2017
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34. Femtosecond x rays link melting of charge-density wave correlations and light-enhanced coherent transport in YBa2Cu3O6.6

Author

Först, M., Frano, A., Le Tacon, M., Keimer, B., Hill, J. P., Cavalleri, A., Dhesi, S. S., Kaiser, Stefan, Mankowsky, R., Hunt, C. R., Turner, J. J., Dakovski, G. L., Minitti, M. P., Robinson, J., and Loew, T.

Subjects
Superconductivity (cond-mat.supr-con), charge density wave correlations, oxygen distortions, charge ordering, superconductivity, Condensed Matter - Superconductivity, Condensed Matter::Superconductivity, FOS: Physical sciences, Physics::Optics, ddc:530
Abstract

We use femtosecond resonant soft x-ray diffraction to measure the optically stimulated ultrafast changes of charge density wave correlations in underdoped YBa2Cu3O6.6. We find that when coherent interlayer transport is enhanced by optical excitation of the apical oxygen distortions, at least 50% of the in-plane charge density wave order is melted. These results indicate that charge ordering and superconductivity may be competing up to the charge ordering transition temperature, with the latter becoming a hidden phase that is accessible only by nonlinear phonon excitation., Comment: 22 pages (including Supplement), 3 figures

Published
2014

35. Self-Referenced Coherent Diffraction X-Ray Movie of Ångstrom- and Femtosecond-Scale Atomic Motion

Author

Glownia, J. M., primary, Natan, A., additional, Cryan, J. P., additional, Hartsock, R., additional, Kozina, M., additional, Minitti, M. P., additional, Nelson, S., additional, Robinson, J., additional, Sato, T., additional, van Driel, T., additional, Welch, G., additional, Weninger, C., additional, Zhu, D., additional, and Bucksbaum, P. H., additional

Published
2016
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36. Ultrafast dynamics of localized magnetic moments in the unconventional Mott insulator Sr2IrO4

Author

Krupin, O, primary, Dakovski, G L, additional, Kim, B J, additional, Kim, J W, additional, Kim, Jungho, additional, Mishra, S, additional, Chuang, Yi-De, additional, Serrao, C R, additional, Lee, W-S, additional, Schlotter, W F, additional, Minitti, M P, additional, Zhu, D, additional, Fritz, D, additional, Chollet, M, additional, Ramesh, R, additional, Molodtsov, S L, additional, and Turner, J J, additional

Published
2016
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38. Strong Influence of Coadsorbate Interaction on CO Desorption Dynamics on Ru(0001) Probed by Ultrafast X-Ray Spectroscopy and Ab Initio Simulations

Author

Xin, H., LaRue, J., Öberg, Henrik, Beye, M., Dell'Angela, M., Turner, J. J., Gladh, Jörgen, Ng, M. L., Sellberg, Jonas A., Kaya, S., Mercurio, G., Hieke, F., Nordlund, D., Schlotter, W. F., Dakovski, G. L., Minitti, M. P., Foehlisch, A., Wolf, M., Wurth, W., Ogasawara, H., Norskov, J. K., Östrom, Henrik, Pettersson, Lars G. M., Nilsson, Anders, Abild-Pedersen, E., Xin, H., LaRue, J., Öberg, Henrik, Beye, M., Dell'Angela, M., Turner, J. J., Gladh, Jörgen, Ng, M. L., Sellberg, Jonas A., Kaya, S., Mercurio, G., Hieke, F., Nordlund, D., Schlotter, W. F., Dakovski, G. L., Minitti, M. P., Foehlisch, A., Wolf, M., Wurth, W., Ogasawara, H., Norskov, J. K., Östrom, Henrik, Pettersson, Lars G. M., Nilsson, Anders, and Abild-Pedersen, E.

Abstract

We show that coadsorbed oxygen atoms have a dramatic influence on the CO desorption dynamics from Ru(0001). In contrast to the precursor-mediated desorption mechanism on Ru(0001), the presence of surface oxygen modifies the electronic structure of Ru atoms such that CO desorption occurs predominantly via the direct pathway. This phenomenon is directly observed in an ultrafast pump-probe experiment using a soft x-ray free-electron laser to monitor the dynamic evolution of the valence electronic structure of the surface species. This is supported with the potential of mean force along the CO desorption path obtained from density-functional theory calculations. Charge density distribution and frozen-orbital analysis suggest that the oxygen-induced reduction of the Pauli repulsion, and consequent increase of the dative interaction between the CO 5 sigma and the charged Ru atom, is the electronic origin of the distinct desorption dynamics. Ab initio molecular dynamics simulations of CO desorption from Ru(0001) and oxygen-coadsorbed Ru(0001) provide further insights into the surface bond-breaking process., AuthorCount:25

Published
2015
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39. Probing the transition state region in catalytic CO oxidation on Ru

Author

Östrom, Henrik, Öberg, Henrik, Xin, H., Larue, J., Beye, M., Dell'Angela, M., Gladh, Jörgen, Ng, M. L., Sellberg, Jonas A., Kaya, S., Mercurio, G., Nordlund, D., Hantschmann, M., Hieke, F., Kuehn, D., Schlotter, W. F., Dakovski, G. L., Turner, J. J., Minitti, M. P., Mitra, A., Moeller, S. P., Foehlisch, A., Wolf, M., Wurth, W., Persson, M., Norskov, J. K., Abild-Pedersen, F., Ogasawara, H., Pettersson, Lars G. M., Nilsson, Anders, Östrom, Henrik, Öberg, Henrik, Xin, H., Larue, J., Beye, M., Dell'Angela, M., Gladh, Jörgen, Ng, M. L., Sellberg, Jonas A., Kaya, S., Mercurio, G., Nordlund, D., Hantschmann, M., Hieke, F., Kuehn, D., Schlotter, W. F., Dakovski, G. L., Turner, J. J., Minitti, M. P., Mitra, A., Moeller, S. P., Foehlisch, A., Wolf, M., Wurth, W., Persson, M., Norskov, J. K., Abild-Pedersen, F., Ogasawara, H., Pettersson, Lars G. M., and Nilsson, Anders

Abstract

Femtosecond x-ray laser pulses are used to probe the carbon monoxide (CO) oxidation reaction on ruthenium (Ru) initiated by an optical laser pulse. On a time scale of a few hundred femtoseconds, the optical laser pulse excites motions of CO and oxygen (O) on the surface, allowing the reactants to collide, and, with a transient close to a picosecond (ps), new electronic states appear in the OK-edge x-ray absorption spectrum. Density functional theory calculations indicate that these result from changes in the adsorption site and bond formation between CO and O with a distribution of OC-O bond lengths close to the transition state (TS). After 1 ps, 10% of the CO populate the TS region, which is consistent with predictions based on a quantum oscillator model., AuthorCount:30

Published
2015
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40. Strong influence of coadsorbate interaction on CO desorption dynamics on Ru(0001) probed by ultrafast X-Ray spectroscopy and ab initio simulations

Author

Kaya, Sarp (ORCID 0000-0002-2591-5843 & YÖK ID 116541), Xin, H; Larue, J; Oberg, H.; Beye, M.; Dell'Angela, M.; Turner, J. J.; Gladh, J.; Ng, M. L.; Sellberg, J. A.; Mercurio, G.; Hieke, F.; Nordlund, D.; Schlotter, W. F.; Dakovski, G. L.; Minitti, M. P.; Fohlisch, A.; Wolf, M.; Wurth, W.; Ogasawara, H.; Norskov, J. K.; Ostrom, H.; Pettersson, L. G. M.; Nilsson, A.; Abild-Pedersen, E., College of Sciences, Department of Chemistry, Kaya, Sarp (ORCID 0000-0002-2591-5843 & YÖK ID 116541), Xin, H; Larue, J; Oberg, H.; Beye, M.; Dell'Angela, M.; Turner, J. J.; Gladh, J.; Ng, M. L.; Sellberg, J. A.; Mercurio, G.; Hieke, F.; Nordlund, D.; Schlotter, W. F.; Dakovski, G. L.; Minitti, M. P.; Fohlisch, A.; Wolf, M.; Wurth, W.; Ogasawara, H.; Norskov, J. K.; Ostrom, H.; Pettersson, L. G. M.; Nilsson, A.; Abild-Pedersen, E., College of Sciences, and Department of Chemistry

Abstract

We show that coadsorbed oxygen atoms have a dramatic influence on the CO desorption dynamics from Ru(0001). In contrast to the precursor-mediated desorption mechanism on Ru(0001), the presence of surface oxygen modifies the electronic structure of Ru atoms such that CO desorption occurs predominantly via the direct pathway. This phenomenon is directly observed in an ultrafast pump-probe experiment using a soft x-ray free-electron laser to monitor the dynamic evolution of the valence electronic structure of the surface species. This is supported with the potential of mean force along the CO desorption path obtained from density-functional theory calculations. Charge density distribution and frozen-orbital analysis suggest that the oxygen-induced reduction of the Pauli repulsion, and consequent increase of the dative interaction between the CO 5 sigma and the charged Ru atom, is the electronic origin of the distinct desorption dynamics. Ab initio molecular dynamics simulations of CO desorption from Ru(0001) and oxygen-coadsorbed Ru(0001) provide further insights into the surface bond-breaking process., US Department of Energy, Basic Energy Science; Swedish Research Council (VR); Department of Energy, Laboratory Directed Research and Development; VolkswagenStiftung; LCLS, Stanford University; Lawrence Berkeley National Laboratory (LBNL); University of Hamburg; Center for Free Electron Laser Science (CFEL)

Published
2015

41. Melting of charge stripes in vibrationally driven La(1.875)Ba(0.125)CuO4: assessing the respective roles of electronic and lattice order in frustrated superconductors

Author

Först, M., Tobey, R. I., Bromberger, H., Wilkins, S. B., Khanna, V., Caviglia, Andrea, Chuang, Y.-D., Lee, W. S., Schlotter, W. F., Turner, J. J., Minitti, M. P., Krupin, O., Xu, Z. J., Wen, J. S., Gu, G. D., Dhesi, S. S., Cavalleri, A., Hill, J. P., and Optical Physics of Condensed Matter

Subjects
Superconductivity (cond-mat.supr-con), HOLES, Condensed Matter - Superconductivity, Condensed Matter::Superconductivity, NONLINEAR PHONONICS, PHASE, ddc:550, LA2-XBAXCUO4, FOS: Physical sciences, Condensed Matter::Strongly Correlated Electrons, ddc:500, SPINS
Abstract

We report femtosecond resonant soft X-ray diffraction measurements of the dynamics of the charge order and of the crystal lattice in non-superconducting, stripe-ordered La1.875Ba0.125CuO4. Excitation of the in-plane Cu-O stretching phonon with a mid-infrared pulse has been previously shown to induce a transient superconducting state in the closely related compound La1.675Eu0.2Sr0.125CuO4. In La1.875Ba0.125CuO4, we find that the charge stripe order melts promptly on a sub-picosecond time scale. Surprisingly, the low temperature tetragonal distortion is only weakly reduced, reacting on significantly longer time scales that do not correlate with light-induced superconductivity. This experiment suggests that charge modulations alone, and not the LTT distortion, prevent superconductivity in equilibrium., 16 pages, 3 figures

Published
2013

42. Magnetic order dynamics in optically excited multiferroicTbMnO3

Author

Johnson, J. A., primary, Kubacka, T., additional, Hoffmann, M. C., additional, Vicario, C., additional, de Jong, S., additional, Beaud, P., additional, Grübel, S., additional, Huang, S.-W., additional, Huber, L., additional, Windsor, Y. W., additional, Bothschafter, E. M., additional, Rettig, L., additional, Ramakrishnan, M., additional, Alberca, A., additional, Patthey, L., additional, Chuang, Y.-D., additional, Turner, J. J., additional, Dakovski, G. L., additional, Lee, W.-S., additional, Minitti, M. P., additional, Schlotter, W., additional, Moore, R. G., additional, Hauri, C. P., additional, Koohpayeh, S. M., additional, Scagnoli, V., additional, Ingold, G., additional, Johnson, S. L., additional, and Staub, U., additional

Published
2015
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43. Ultrafast x-ray and optical signatures of phase competition and separation underlying the photoinduced metallic phase inPr1−xCaxMnO3

Author

Langner, M. C., primary, Zhou, S., additional, Coslovich, G., additional, Chuang, Y.-D., additional, Zhu, Y., additional, Robinson, J. S., additional, Schlotter, W. F., additional, Turner, J. J., additional, Minitti, M. P., additional, Moore, R. G., additional, Lee, W. S., additional, Lu, D. H., additional, Doering, D., additional, Denes, P., additional, Tomioka, Y., additional, Tokura, Y., additional, Kaindl, R. A., additional, and Schoenlein, R. W., additional

Published
2015
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44. Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface

Author

Först, M., primary, Caviglia, A. D., additional, Scherwitzl, R., additional, Mankowsky, R., additional, Zubko, P., additional, Khanna, V., additional, Bromberger, H., additional, Wilkins, S. B., additional, Chuang, Y.-D., additional, Lee, W. S., additional, Schlotter, W. F., additional, Turner, J. J., additional, Dakovski, G. L., additional, Minitti, M. P., additional, Robinson, J., additional, Clark, S. R., additional, Jaksch, D., additional, Triscone, J.-M., additional, Hill, J. P., additional, Dhesi, S. S., additional, and Cavalleri, A., additional

Published
2015
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45. Imaging Molecular Motion: Femtosecond X-Ray Scattering of an Electrocyclic Chemical Reaction

Author

Minitti, M. P., primary, Budarz, J. M., additional, Kirrander, A., additional, Robinson, J. S., additional, Ratner, D., additional, Lane, T. J., additional, Zhu, D., additional, Glownia, J. M., additional, Kozina, M., additional, Lemke, H. T., additional, Sikorski, M., additional, Feng, Y., additional, Nelson, S., additional, Saita, K., additional, Stankus, B., additional, Northey, T., additional, Hastings, J. B., additional, and Weber, P. M., additional

Published
2015
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46. Strong Influence of Coadsorbate Interaction on CO Desorption Dynamics on Ru(0001) Probed by Ultrafast X-Ray Spectroscopy andAb InitioSimulations

Author

Xin, H., primary, LaRue, J., additional, Öberg, H., additional, Beye, M., additional, Dell’Angela, M., additional, Turner, J. J., additional, Gladh, J., additional, Ng, M. L., additional, Sellberg, J. A., additional, Kaya, S., additional, Mercurio, G., additional, Hieke, F., additional, Nordlund, D., additional, Schlotter, W. F., additional, Dakovski, G. L., additional, Minitti, M. P., additional, Föhlisch, A., additional, Wolf, M., additional, Wurth, W., additional, Ogasawara, H., additional, Nørskov, J. K., additional, Öström, H., additional, Pettersson, L. G. M., additional, Nilsson, A., additional, and Abild-Pedersen, F., additional

Published
2015
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47. Principles of femtosecond X-ray/optical cross-correlation with X-ray induced transient optical reflectivity in solids

Author

Eckert, S., primary, Beye, M., additional, Pietzsch, A., additional, Quevedo, W., additional, Hantschmann, M., additional, Ochmann, M., additional, Ross, M., additional, Minitti, M. P., additional, Turner, J. J., additional, Moeller, S. P., additional, Schlotter, W. F., additional, Dakovski, G. L., additional, Khalil, M., additional, Huse, N., additional, and Föhlisch, A., additional

Published
2015
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48. Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5

Author

Mankowsky, R., primary, Subedi, A., additional, Först, M., additional, Mariager, S. O., additional, Chollet, M., additional, Lemke, H. T., additional, Robinson, J. S., additional, Glownia, J. M., additional, Minitti, M. P., additional, Frano, A., additional, Fechner, M., additional, Spaldin, N. A., additional, Loew, T., additional, Keimer, B., additional, Georges, A., additional, and Cavalleri, A., additional

Published
2014
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49. The Linac Coherent Light Source: Recent Developments and Future Plans.

Author

Schoenlein, R. W., Boutet, S., Minitti, M. P., and Dunne, A. M.

Subjects
LIGHT sources, X-rays, STRUCTURAL dynamics
Abstract

The development of X-ray free-electron lasers (XFELs) has launched a new era in X-ray science by providing ultrafast coherent X-ray pulses with a peak brightness that is approximately one billion times higher than previous X-ray sources. The Linac Coherent Light Source (LCLS) facility at the SLAC National Accelerator Laboratory, the world's first hard X-ray FEL, has already demonstrated a tremendous scientific impact across broad areas of science. Here, a few of the more recent representative highlights from LCLS are presented in the areas of atomic, molecular, and optical science; chemistry; condensed matter physics; matter in extreme conditions; and biology. This paper also outlines the near term upgrade (LCLS-II) and motivating science opportunities for ultrafast X-rays in the 0.25-5 keV range at repetition rates up to 1 MHz. Future plans to extend the X-ray energy reach to beyond 13 keV (<1 Å) at high repetition rate (LCLS-II-HE) are envisioned, motivated by compelling new science of structural dynamics at the atomic scale. [ABSTRACT FROM AUTHOR]

Published
2017
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50. Melting of Charge Stripes in Vibrationally DrivenLa1.875Ba0.125CuO4: Assessing the Respective Roles of Electronic and Lattice Order in Frustrated Superconductors

Author

Först, M., primary, Tobey, R. I., additional, Bromberger, H., additional, Wilkins, S. B., additional, Khanna, V., additional, Caviglia, A. D., additional, Chuang, Y.-D., additional, Lee, W. S., additional, Schlotter, W. F., additional, Turner, J. J., additional, Minitti, M. P., additional, Krupin, O., additional, Xu, Z. J., additional, Wen, J. S., additional, Gu, G. D., additional, Dhesi, S. S., additional, Cavalleri, A., additional, and Hill, J. P., additional

Published
2014
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