Phonon dispersion of Mo-stabilized γ -U measured using inelastic x-ray scattering

Z. E. Brubaker; S. Ran; A. H. Said; M. E. Manley; P. Söderlind; D. Rosas; Y. Idell; R. J. Zieve; N. P. Butch; J. R. Jeffries

doi:10.1103/PhysRevB.100.094311

Phonon dispersion of Mo-stabilized γ -U measured using inelastic x-ray scattering

Z. E. Brubaker, S. Ran, A. H. Said, M. E. Manley, P. Söderlind, D. Rosas, Y. Idell, R. J. Zieve, N. P. Butch, J. R. Jeffries

Neutron & X-Ray Scattering, & Thermophys

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10 Scopus citations

Abstract

We have measured the room-temperature phonon spectrum of Mo-stabilized γ-U. The dispersion curves show unusual softening near the H point, q=[1/2,1/2,1/2], which may derive from the metastability of the γ-U phase or from strong electron-phonon coupling. Near the zone center, the dispersion curves agree well with theory, though significant differences are observed away from the zone center. The experimental phonon density of states is shifted to higher energy compared to theory and high-temperature neutron scattering. The elastic constants of γ-UMo are similar to those of body-centered cubic elemental metals.

Original language	English
Article number	094311
Journal	Physical Review B
Volume	100
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.100.094311
State	Published - Sep 30 2019

Funding

This work was performed under LDRD (Tracking Code 18-SI-001) and under the auspices of the US Department of Energy by Lawrence Livermore National Laboratory (LLNL) under Contract No. DE-AC52-07NA27344. This material is based upon work supported by the National Science Foundation under Grant No. NSF DMR-1609855. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. M.E.M. was supported by the Center for Thermal Transport Under Irradiation, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, United States, Office of Basic Energy Sciences. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the U.S. Department of Energy (DOE). The U.S. government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan [37] .

Funders	Funder number
Center for Thermal Transport
DOE Office of Science
US Department of Energy
National Science Foundation
U.S. Department of Energy
Office of Science
Basic Energy Sciences	DE-AC05-00OR22725
Basic Energy Sciences
Argonne National Laboratory
Lawrence Livermore National Laboratory
Laboratory Directed Research and Development	18-SI-001
Laboratory Directed Research and Development

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10.1103/PhysRevB.100.094311

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title = "Phonon dispersion of Mo-stabilized γ -U measured using inelastic x-ray scattering",

abstract = "We have measured the room-temperature phonon spectrum of Mo-stabilized γ-U. The dispersion curves show unusual softening near the H point, q=[1/2,1/2,1/2], which may derive from the metastability of the γ-U phase or from strong electron-phonon coupling. Near the zone center, the dispersion curves agree well with theory, though significant differences are observed away from the zone center. The experimental phonon density of states is shifted to higher energy compared to theory and high-temperature neutron scattering. The elastic constants of γ-UMo are similar to those of body-centered cubic elemental metals.",

author = "Brubaker, {Z. E.} and S. Ran and Said, {A. H.} and Manley, {M. E.} and P. S{\"o}derlind and D. Rosas and Y. Idell and Zieve, {R. J.} and Butch, {N. P.} and Jeffries, {J. R.}",

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doi = "10.1103/PhysRevB.100.094311",

language = "English",

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AU - Brubaker, Z. E.

AU - Ran, S.

AU - Said, A. H.

AU - Manley, M. E.

AU - Söderlind, P.

AU - Rosas, D.

AU - Idell, Y.

AU - Zieve, R. J.

AU - Butch, N. P.

AU - Jeffries, J. R.

PY - 2019/9/30

Y1 - 2019/9/30

N2 - We have measured the room-temperature phonon spectrum of Mo-stabilized γ-U. The dispersion curves show unusual softening near the H point, q=[1/2,1/2,1/2], which may derive from the metastability of the γ-U phase or from strong electron-phonon coupling. Near the zone center, the dispersion curves agree well with theory, though significant differences are observed away from the zone center. The experimental phonon density of states is shifted to higher energy compared to theory and high-temperature neutron scattering. The elastic constants of γ-UMo are similar to those of body-centered cubic elemental metals.

AB - We have measured the room-temperature phonon spectrum of Mo-stabilized γ-U. The dispersion curves show unusual softening near the H point, q=[1/2,1/2,1/2], which may derive from the metastability of the γ-U phase or from strong electron-phonon coupling. Near the zone center, the dispersion curves agree well with theory, though significant differences are observed away from the zone center. The experimental phonon density of states is shifted to higher energy compared to theory and high-temperature neutron scattering. The elastic constants of γ-UMo are similar to those of body-centered cubic elemental metals.

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DO - 10.1103/PhysRevB.100.094311

M3 - Article

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SN - 2469-9950

VL - 100

JO - Physical Review B

JF - Physical Review B

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ER -

Phonon dispersion of Mo-stabilized γ -U measured using inelastic x-ray scattering

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