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Your search keyword '"J. Ollivier"' showing total 5 results
Start Over Author "J. Ollivier" Journal physical review b
5 results on '"J. Ollivier"'

1. Magnetically ordered and kagome quantum spin liquid states in the Zn-doped claringbullite series

Author

M. Georgopoulou, B. Fåk, D. Boldrin, J. R. Stewart, C. Ritter, E. Suard, J. Ollivier, and A. S. Wills

Subjects
Condensed Matter - Strongly Correlated Electrons, Strongly Correlated Electrons (cond-mat.str-el), FOS: Physical sciences
Abstract

Neutron scattering measurements have been performed on deuterated powder samples of claringbullite and Zn-doped claringbullite (Zn$_x$Cu$_{4-x}$(OD)$_{6}$FCl). At low temperatures, claringbullite Cu$_4$(OD)$_{6}$FCl forms a distorted pyrochlore lattice with long-range magnetic order and spin-wave-like magnetic excitations. Partial Zn doping leads to the nominal ZnCu$_3$(OD)$_{6}$FCl compound, a geometrically frustrated spin-1/2 kagome antiferromagnet that shows no transition to magnetic order down to 1.5 K. The magnetic excitations form a gapless continuum, a signature of fractional excitations in a quantum spin liquid., 8 pages, 5 figures, Supplemental Material

Published
2023
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3. Putative spin-nematic phase in BaCdVO(PO₄)₂

Author

M., Skoulatos, F., Rucker, G. J., Nilsen, A., Bertin, E., Pomjakushina, J., Ollivier, A., Schneidewind, R., Georgii, O., Zaharko, L., Keller, Ch., Rüegg, C., Pfleiderer, B., Schmidt, N., Shannon, A., Kriele, A., Senyshyn, and A., Smerald

Published
2019
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4. Phonons in an aperiodic alkane/urea composite crystal studied by inelastic x-ray scattering

Author

Bertrand Toudic, Laurent Guérin, Claude Ecolivet, Mariana Verezhak, Philippe Rabiller, Céline Mariette, Alexei Bosak, J. Ollivier, Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] (LIPhy), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut Laue-Langevin (ILL), ILL, European Synchrotron Radiation Facility (ESRF), European Synchrotron Radiation Facility, 701647, Horizon 2020, 200021L_169753, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, and Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Materials science, Nonadecane, Phonon, Scattering, 02 engineering and technology, Inelastic scattering, 021001 nanoscience & nanotechnology, 01 natural sciences, Molecular physics, Transverse mode, chemistry.chemical_compound, chemistry, Aperiodic graph, 0103 physical sciences, State of matter, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 010306 general physics, 0210 nano-technology, Translational symmetry
Abstract

International audience; Aperiodic composite crystals belong to a new state of matter that possesses long-range order without translational symmetry. We report measurements of low-lying phonon branches in a n-alkane/urea compound that provide a new insight to the urea sub-lattice and the commensurate basal plane dynamics. Focusing on the thoroughly studied n-nonadecane/urea compound makes a comparison with other inelastic scattering results possible, allowing the observation of a new aperiodic elastic signature. Using three techniques, slight but reproducible difference in sound velocities is observed between the transverse mode propagating along the aperiodic direction and polarized in the commensurate basal plane, and the one polarized along the aperiodic direction propagating in the basal plane.

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5. Spin correlations of quantum spin liquid and quadrupole-ordered states of Tb 2+ x Ti 2- x O 7+ y .

Author

Kadowaki H, Wakita M, Fåk B, Ollivier J, Ohira-Kawamura S, Nakajima K, and Lynn JW

Abstract

Spin correlations of the frustrated pyrochlore oxide Tb 2+ x Ti 2- x O 7+ y have been investigated by using inelastic neutron scattering on single-crystalline samples ( x = -0.007, 0.000, and 0.003), which have the putative quantum-spin-liquid (QSL) or electric-quadrupolar ground states. Spin correlations, which are notably observed in nominally elastic scattering, show short-range correlations around L points [ q = ( 1 2 , 1 2 , 1 2 ) ] , tiny antiferromagnetic Bragg scattering at L and Γ points, and pinch-point-type structures around Γ points. The short-range spin correlations were analyzed using a random-phase approximation (RPA) assuming the paramagnetic state and two-spin interactions among Ising spins. These analyses have shown that the RPA scattering intensity well reproduces the experimental data using temperature- and x -dependent coupling constants of up to tenth-neighbor site pairs. This suggests that no symmetry breaking occurs in the QSL sample and that a quantum treatment beyond the semiclassical RPA approach is required. Implications of the experimental data and the RPA analyses are discussed.

Published
2019

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