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568 results on '"Rønnow, H. M."'

154. Radial Spin Texture of the Weyl Fermions in Chiral Tellurium

Author

Gatti, G., primary, Gosálbez-Martínez, D., additional, Tsirkin, S. S., additional, Fanciulli, M., additional, Puppin, M., additional, Polishchuk, S., additional, Moser, S., additional, Testa, L., additional, Martino, E., additional, Roth, S., additional, Bugnon, Ph., additional, Moreschini, L., additional, Bostwick, A., additional, Jozwiak, C., additional, Rotenberg, E., additional, Di Santo, G., additional, Petaccia, L., additional, Vobornik, I., additional, Fujii, J., additional, Wong, J., additional, Jariwala, D., additional, Atwater, H. A., additional, Rønnow, H. M., additional, Chergui, M., additional, Yazyev, O. V., additional, Grioni, M., additional, and Crepaldi, A., additional

Published
2020
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160. High-Temperature Charge-Stripe Correlations in La1.675Eu0.2Sr0.125CuO4

Author

Wang, Qisi, primary, Horio, M., additional, von Arx, K., additional, Shen, Y., additional, John Mukkattukavil, D., additional, Sassa, Y., additional, Ivashko, O., additional, Matt, C. E., additional, Pyon, S., additional, Takayama, T., additional, Takagi, H., additional, Kurosawa, T., additional, Momono, N., additional, Oda, M., additional, Adachi, T., additional, Haidar, S. M., additional, Koike, Y., additional, Tseng, Y., additional, Zhang, W., additional, Zhao, J., additional, Kummer, K., additional, Garcia-Fernandez, M., additional, Zhou, Ke-Jin, additional, Christensen, N. B., additional, Rønnow, H. M., additional, Schmitt, T., additional, and Chang, J., additional

Published
2020
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163. High field magnetization ofFePS3

Author

Wildes, A. R., primary, Lançon, D., additional, Chan, M. K., additional, Weickert, F., additional, Harrison, N., additional, Simonet, V., additional, Zhitomirsky, M. E., additional, Gvozdikova, M. V., additional, Ziman, T., additional, and Rønnow, H. M., additional

Published
2020
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164. Field-induced anisotropy in the quasi-two-dimensional weakly anisotropic antiferromagnet [ CuCl ( pyz ) 2 ] BF 4

Author

Kwon, Sungmin, Jeong, M., Kubus, Mariusz, Wehinger, B., Krämer, Karl, Rüegg, Ch., Rønnow, H. M., and Lee, Soonchil

Subjects
530 Physics, 540 Chemistry, Condensed Matter::Strongly Correlated Electrons
Abstract

We measured NMR and magnetic susceptibility for the quasi-two-dimensional, weakly XY-like, spin-1/2 square-lattice Heisenberg antiferromagnet [CuCl(pyz)2]BF4 (pyz = pyrazine =N2C4H4) near the critical temperature. The Néel temperature TN and the order-parameter critical exponent β were obtained from the NMR line broadening as a function of temperature. As the applied field strength (H∥c) was increased, TN increased and β decreased. This behavior indicates that the field effectively enhanced XY anisotropy. The susceptibility as a function of temperature did not show a clear feature for TN, but showed field-dependent minima below TN for both H∥c and H∥ab, where minimum features disappeared for μ0H>2T.

Published
2019
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165. Strain-engineering Mott-insulating $La_2CuO_4$

Author

Ivashko, O; https://orcid.org/0000-0002-4869-8175, Horio, M; https://orcid.org/0000-0003-2669-5368, Wan, W, Christensen, N B, McNally, D E, Paris, E, Tseng, Y, Shaik, N E, Rønnow, H M; https://orcid.org/0000-0002-8832-8865, Wei, H I; https://orcid.org/0000-0002-8946-755X, Adamo, C, Lichtensteiger, C, Gibert, M; https://orcid.org/0000-0001-8856-6831, Beasley, M R, Shen, K M, Tomczak, J M; https://orcid.org/0000-0003-1581-8799, Schmitt, T, Chang, J; https://orcid.org/0000-0002-4655-1516, Ivashko, O; https://orcid.org/0000-0002-4869-8175, Horio, M; https://orcid.org/0000-0003-2669-5368, Wan, W, Christensen, N B, McNally, D E, Paris, E, Tseng, Y, Shaik, N E, Rønnow, H M; https://orcid.org/0000-0002-8832-8865, Wei, H I; https://orcid.org/0000-0002-8946-755X, Adamo, C, Lichtensteiger, C, Gibert, M; https://orcid.org/0000-0001-8856-6831, Beasley, M R, Shen, K M, Tomczak, J M; https://orcid.org/0000-0003-1581-8799, Schmitt, T, and Chang, J; https://orcid.org/0000-0002-4655-1516

Abstract

The transition temperature Tc of unconventional superconductivity is often tunable. For a monolayer of FeSe, for example, the sweet spot is uniquely bound to titanium-oxide substrates. By contrast for La2−xSrxCuO4 thin films, such substrates are sub-optimal and the highest Tc is instead obtained using LaSrAlO4. An outstanding challenge is thus to understand the optimal conditions for superconductivity in thin films: which microscopic parameters drive the change in Tc and how can we tune them? Here we demonstrate, by a combination of x-ray absorption and resonant inelastic x-ray scattering spectroscopy, how the Coulomb and magnetic-exchange interaction of La2CuO4 thin films can be enhanced by compressive strain. Our experiments and theoretical calculations establish that the substrate producing the largest Tc under doping also generates the largest nearest neighbour hopping integral, Coulomb and magnetic-exchange interaction. We hence suggest optimising the parent Mott state as a strategy for enhancing the superconducting transition temperature in cuprates.

Published
2019

169. Strain-Engineering Mott-Insulating La$_2$CuO$_4$

Author

Ivashko, O, Horio, M, Wan, W, Christensen, N B, McNally, D E, Paris, E, Tseng, Y, Shaik, N E, Rønnow, H M, Wei, H I, Adamo, C, Lichtensteiger, C, Gibert, M, Beasley, M R, Shen, K M, Tomczak, J M, Schmitt, T, Chang, J, University of Zurich, and Ivashko, O

Subjects
530 Physics, Science, General Physics and Astronomy, FOS: Physical sciences, 1600 General Chemistry, Genetics and Molecular Biology, 10192 Physics Institute, ddc:500.2, Article, state, Superconductivity (cond-mat.supr-con), Condensed Matter::Materials Science, Condensed Matter - Strongly Correlated Electrons, 1300 General Biochemistry, Genetics and Molecular Biology, Condensed Matter::Superconductivity, lcsh:Science, Strongly Correlated Electrons (cond-mat.str-el), Condensed Matter - Superconductivity, temperature, General Chemistry, sr, 3100 General Physics and Astronomy, fermi-surface, thin-films, General Biochemistry, mpbh, lcsh:Q, Condensed Matter::Strongly Correlated Electrons
Abstract

The transition temperature $T_\textrm{c}$ of unconventional superconductivity is often tunable. For a monolayer of FeSe, for example, the sweet spot is uniquely bound to titanium-oxide substrates. By contrast for La$_{2-\mathrm{x}}$Sr$_\mathrm{x}$CuO$_4$ thin films, such substrates are sub-optimal and the highest $T_\textrm{c}$ is instead obtained using LaSrAlO$_4$. An outstanding challenge is thus to understand the optimal conditions for superconductivity in thin films: which microscopic parameters drive the change in $T_\mathrm{c}$ and how can we tune them? Here we demonstrate, by a combination of x-ray absorption and resonant inelastic x-ray scattering spectroscopy, how the Coulomb and magnetic-exchange interaction of La$_2$CuO$_4$ thin films can be enhanced by compressive strain. Our experiments and theoretical calculations establish that the substrate producing the largest $T_\textrm{c}$ under doping also generates the largest nearest neighbour hopping integral, Coulomb and magnetic-exchange interaction. We hence suggest optimising the parent Mott state as a strategy for enhancing the superconducting transition temperature in cuprates., 15 pages, 7 figures and 2 tables (including Supplementary Information)

Published
2018

171. Deformation of the moving magnetic skyrmion lattice in MnSi under electric current flow

Author

Okuyama, D., primary, Bleuel, M., additional, White, J. S., additional, Ye, Q., additional, Krzywon, J., additional, Nagy, G., additional, Im, Z. Q., additional, Živković, I., additional, Bartkowiak, M., additional, Rønnow, H. M., additional, Hoshino, S., additional, Iwasaki, J., additional, Nagaosa, N., additional, Kikkawa, A., additional, Taguchi, Y., additional, Tokura, Y., additional, Higashi, D., additional, Reim, J. D., additional, Nambu, Y., additional, and Sato, T. J., additional

Published
2019
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173. Publisher's Note: Topological spin-hedgehog crystals of a chiral magnet as engineered with magnetic anisotropy [Phys. Rev. B 96, 220414(R) (2017)]

Author

Kanazawa, N., primary, White, J. S., additional, Rønnow, H. M., additional, Dewhurst, C. D., additional, Morikawa, D., additional, Shibata, K., additional, Arima, T., additional, Kagawa, F., additional, Tsukazaki, A., additional, Kozuka, Y., additional, Ichikawa, M., additional, Kawasaki, M., additional, and Tokura, Y., additional

Published
2019
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182. Spin-Orbital Excitations in Ca2RuO4 Revealed by Resonant Inelastic X-Ray Scattering

Author

Das, L., primary, Forte, F., additional, Fittipaldi, R., additional, Fatuzzo, C. G., additional, Granata, V., additional, Ivashko, O., additional, Horio, M., additional, Schindler, F., additional, Dantz, M., additional, Tseng, Yi, additional, McNally, D. E., additional, Rønnow, H. M., additional, Wan, W., additional, Christensen, N. B., additional, Pelliciari, J., additional, Olalde-Velasco, P., additional, Kikugawa, N., additional, Neupert, T., additional, Vecchione, A., additional, Schmitt, T., additional, Cuoco, M., additional, and Chang, J., additional

Published
2018
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183. Laser-Induced Skyrmion Writing and Erasing in an Ultrafast Cryo-Lorentz Transmission Electron Microscope

Author

Berruto, G., primary, Madan, I., additional, Murooka, Y., additional, Vanacore, G. M., additional, Pomarico, E., additional, Rajeswari, J., additional, Lamb, R., additional, Huang, P., additional, Kruchkov, A. J., additional, Togawa, Y., additional, LaGrange, T., additional, McGrouther, D., additional, Rønnow, H. M., additional, and Carbone, F., additional

Published
2018
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185. 24-spin clusters in the mineral boleite KPb26Ag9Cu24Cl62(OH)48

Author

Dreier, E. S., primary, Holm, S. L., additional, Lønbæk, K., additional, Hansen, U. B., additional, Medarde, M., additional, Živković, I., additional, Babkevich, P., additional, Ruminy, M., additional, Casati, N., additional, Piovano, A., additional, Rols, S., additional, Nilsen, G. J., additional, Boehm, M., additional, Skoulatos, M., additional, Schefer, J., additional, Rønnow, H. M., additional, Fennell, T., additional, and Lefmann, K., additional

Published
2018
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189. Charge-Stripe Order and Superconductivity in Ir1−xPtxTe2

Author

Ivashko, O., primary, Yang, L., additional, Destraz, D., additional, Martino, E., additional, Chen, Y., additional, Guo, C. Y., additional, Yuan, H. Q., additional, Pisoni, A., additional, Matus, P., additional, Pyon, S., additional, Kudo, K., additional, Nohara, M., additional, Forró, L., additional, Rønnow, H. M., additional, Hücker, M., additional, v. Zimmermann, M., additional, and Chang, J., additional

Published
2017
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190. Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2D2O in a transverse field

Author

Larsen, J., Schäffer, T. K., Hansen, U. B., Holm, S. L., Ahl, Sonja Rosenlund, Toft-Petersen, Rasmus, Taylor, J., Ehlers, G., Jensen, J., Rønnow, H. M., Lefmann, K., Christensen, Niels Bech, Larsen, J., Schäffer, T. K., Hansen, U. B., Holm, S. L., Ahl, Sonja Rosenlund, Toft-Petersen, Rasmus, Taylor, J., Ehlers, G., Jensen, J., Rønnow, H. M., Lefmann, K., and Christensen, Niels Bech

Abstract

We present experimental evidence for a quantum phase transition in the easy-axis S = 3/2 anisotropic quasione-dimensional ferromagnet CoCl2 · 2D2O in a transverse field. Elastic neutron scattering shows that the magnetic order parameter vanishes at a transverse critical field μ0Hc = 16.05(4) T, while inelastic neutron scattering shows that the gap in the magnetic excitation spectrum vanishes at the same field value, and reopens for H>Hc. The field dependence of the order parameter and the gap are well described by critical exponents β = 0.45 ± 0.09 and zν close to 1/2, implying that the quantum phase transition in CoCl2 · 2D2O differs significantly from the textbook version of a S = 1/2 Ising chain in a transverse field. We attribute the difference to weak but finite three-dimensionality of the magnetic interactions.

Published
2017

191. Magnetic Dynamics Studied by Time-Resolved Electron Microscopy

Author

Carbone, F., Jayaraman, R., Murooka, Y., Mancini, G.F., Baldini, E., Huang, P., Cantoni, M., Magrez, A., McGrouther, D., Giamarchi, T., Rønnow, H. M., Carbone, F., Jayaraman, R., Murooka, Y., Mancini, G.F., Baldini, E., Huang, P., Cantoni, M., Magrez, A., McGrouther, D., Giamarchi, T., and Rønnow, H. M.

Published
2017

192. Hallmarks of Hunds coupling in the Mott insulator Ca2RuO4

Author

Sutter, D; https://orcid.org/0000-0003-0139-8076, Fatuzzo, C G, Moser, S, Kim, M; https://orcid.org/0000-0003-4201-4462, Fittipaldi, R, Vecchione, A, Granata, V, Sassa, Y, Cossalter, F, Gatti, G, Grioni, M, Rønnow, H M, Plumb, N C, Matt, C E, Shi, M, Hoesch, M, Kim, T K, Chang, T-R, Jeng, H-T, Jozwiak, C, Bostwick, A, Rotenberg, E; https://orcid.org/0000-0002-3979-8844, Georges, A, Neupert, T; https://orcid.org/0000-0003-0604-041X, Chang, J, Sutter, D; https://orcid.org/0000-0003-0139-8076, Fatuzzo, C G, Moser, S, Kim, M; https://orcid.org/0000-0003-4201-4462, Fittipaldi, R, Vecchione, A, Granata, V, Sassa, Y, Cossalter, F, Gatti, G, Grioni, M, Rønnow, H M, Plumb, N C, Matt, C E, Shi, M, Hoesch, M, Kim, T K, Chang, T-R, Jeng, H-T, Jozwiak, C, Bostwick, A, Rotenberg, E; https://orcid.org/0000-0002-3979-8844, Georges, A, Neupert, T; https://orcid.org/0000-0003-0604-041X, and Chang, J

Published
2017

193. Damped spin excitations in a doped cuprate superconductor with orbital hybridization

Author

Ivashko, O, Shaik, N E, Lu, X, Fatuzzo, C G, Dantz, M, Freeman, P G, McNally, D E, Destraz, D, Christensen, N B, Kurosawa, T, Momono, N, Oda, M, Matt, C E, Monney, C, Rønnow, H M, Schmitt, T, Chang, J, Ivashko, O, Shaik, N E, Lu, X, Fatuzzo, C G, Dantz, M, Freeman, P G, McNally, D E, Destraz, D, Christensen, N B, Kurosawa, T, Momono, N, Oda, M, Matt, C E, Monney, C, Rønnow, H M, Schmitt, T, and Chang, J

Published
2017

194. Charge-stripe order and superconductivity in Ir1−xPtxTe2

Author

Ivashko, O; https://orcid.org/0000-0002-4869-8175, Yang, L, Destraz, D, Martino, E, Chen, Y, Guo, C Y, Yuan, H. Q, Pisoni, A, Matus, P, Pyon, S, Kudo, K, Nohara, M, Forró, L, Rønnow, H M; https://orcid.org/0000-0002-8832-8865, Hücker, M, von Zimmermann, Martin; https://orcid.org/0000-0002-9320-6846, Chang, J, Ivashko, O; https://orcid.org/0000-0002-4869-8175, Yang, L, Destraz, D, Martino, E, Chen, Y, Guo, C Y, Yuan, H. Q, Pisoni, A, Matus, P, Pyon, S, Kudo, K, Nohara, M, Forró, L, Rønnow, H M; https://orcid.org/0000-0002-8832-8865, Hücker, M, von Zimmermann, Martin; https://orcid.org/0000-0002-9320-6846, and Chang, J

Abstract

A combined resistivity and hard x-ray diffraction study of superconductivity and charge ordering in Ir Ir1-xPtxTe2, as a function of Pt substitution and externally applied hydrostatic pressure, is presented. Experiments are focused on samples near the critical composition x c ~ 0.045 where competition and switching between charge order and superconductivity is established. We show that charge order as a function of pressure in Ir0.95Pt0.05Te2 is preempted - and hence triggered - by a structural transition. Charge ordering appears uniaxially along the short crystallographic (1, 0, 1) domain axis with a (1/5, 0, 1/5) modulation. Based on these results we draw a charge-order phase diagram and discuss the relation between stripe ordering and superconductivity.

Published
2017

195. Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2D2O in a transverse field

Author

Larsen, J., primary, Schäffer, T. K., additional, Hansen, U. B., additional, Holm, S. L., additional, Ahl, S. R., additional, Toft-Petersen, R., additional, Taylor, J., additional, Ehlers, G., additional, Jensen, J., additional, Rønnow, H. M., additional, Lefmann, K., additional, and Christensen, N. B., additional

Published
2017
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197. Electronic and magnetic excitations in the half-stuffed Cu-O planes of Ba2Cu3O4Cl2 measured by resonant inelastic x-ray scattering

Author

Fatale, S., primary, Fatuzzo, C. G., additional, Babkevich, P., additional, Shaik, N. E., additional, Pelliciari, J., additional, Lu, X., additional, McNally, D. E., additional, Schmitt, T., additional, Kikkawa, A., additional, Taguchi, Y., additional, Tokura, Y., additional, Normand, B., additional, Rønnow, H. M., additional, and Grioni, M., additional

Published
2017
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198. J1−J2 square lattice antiferromagnetism in the orbitally quenched insulator MoOPO4

Author

Yang, L., primary, Jeong, M., additional, Babkevich, P., additional, Katukuri, V. M., additional, Náfrádi, B., additional, Shaik, N. E., additional, Magrez, A., additional, Berger, H., additional, Schefer, J., additional, Ressouche, E., additional, Kriener, M., additional, Živković, I., additional, Yazyev, O. V., additional, Forró, L., additional, and Rønnow, H. M., additional

Published
2017
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199. 4-spin plaquette singlet state in the Shastry–Sutherland compound SrCu2(BO3)2

Author

Zayed, M. E., primary, Rüegg, Ch., additional, Larrea J., J., additional, Läuchli, A. M., additional, Panagopoulos, C., additional, Saxena, S. S., additional, Ellerby, M., additional, McMorrow, D. F., additional, Strässle, Th., additional, Klotz, S., additional, Hamel, G., additional, Sadykov, R. A., additional, Pomjakushin, V., additional, Boehm, M., additional, Jiménez–Ruiz, M., additional, Schneidewind, A., additional, Pomjakushina, E., additional, Stingaciu, M., additional, Conder, K., additional, and Rønnow, H. M., additional

Published
2017
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200. Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2

Author

Babkevich, P., primary, Shaik, N. E., additional, Lançon, D., additional, Kikkawa, A., additional, Enderle, M., additional, Ewings, R. A., additional, Walker, H. C., additional, Adroja, D. T., additional, Manuel, P., additional, Khalyavin, D. D., additional, Taguchi, Y., additional, Tokura, Y., additional, Soda, M., additional, Masuda, T., additional, and Rønnow, H. M., additional

Published
2017
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