Inelastic x-ray scattering measurements of phonon dynamics in URu2Si2

Gardner, D. R.; Bonnoit, C. J.; Chisnell, R.; Said, A. H.; Leu, B. M.; Williams, Travis J.; Luke, G. M.; Lee, Y. S.

doi:10.1103/PhysRevB.93.075123

Inelastic x-ray scattering measurements of phonon dynamics in URu₂Si₂

Journal Article · Thu Feb 11 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.075123· OSTI ID:1302920

Gardner, D. R. ^[1]; Bonnoit, C. J. ^[1]; Chisnell, R. ^[1]; Said, A. H. ^[2]; Leu, B. M. ^[2]; Williams, Travis J. ^[3]; Luke, G. M. ^[4]; Lee, Y. S. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
McMaster Univ., Hamilton, ON (Canada); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
McMaster Univ., Hamilton, ON (Canada)

In this paper, we study high-resolution inelastic x-ray scattering measurements of the acoustic phonons of URu₂Si₂. 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. In addition, 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725

OSTI ID:: 1302920

Alternate ID(s):: OSTI ID: 1237785
OSTI ID: 1368071

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 7 Vol. 93; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (1)

Hidden order and beyond: an experimental—theoretical overview of the multifaceted behavior of URu ₂ Si ₂ Mydosh, J. A.; Oppeneer, P. M.; Riseborough, P. S. Journal of Physics: Condensed Matter, Vol. 32, Issue 14 https://doi.org/10.1088/1361-648x/ab5eba	journal	January 2020

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