Inelastic x-ray scattering measurements of phonon dynamics in URu[subscript 2] Si[subscript 2]
Author(s)
Said, A. H.; Leu, B. M.; Williams, T. J.; Luke, G. M.; Gardner, Dillon R.; Bonnoit, Craig J.; Chisnell, Robin; Lee, Young S.; ... Show more Show less
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We report high-resolution inelastic x-ray scattering measurements of the acoustic phonons of URu[subscript 2] Si[subscript 2]. At all temperatures, the longitudinal acoustic phonon linewidths are anomalously broad at small wave vectors revealing a previously unknown anharmonicity. The phonon modes do not change significantly upon cooling into the hidden order phase. Our data suggest that the increase in thermal conductivity in the hidden order phase cannot be driven by a change in phonon dispersions or lifetimes. Hence, the phonon contribution to the thermal conductivity is likely much less significant compared to that of the magnetic excitations in the low temperature phase.
Date issued
2016-02Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physical Review B
Publisher
American Physical Society
Citation
Gardner, D. R., C. J. Bonnoit, R. Chisnell, A. H. Said, B. M. Leu, T. J. Williams, G. M. Luke, and Y. S. Lee. “Inelastic x-Ray Scattering Measurements of Phonon Dynamics in URu[subscript 2] Si[subscript 2].” Physical Review B 93, no. 7 (February 11, 2016). © 2016 American Physical Society
Version: Final published version
ISSN
2469-9950
2469-9969