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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. As a result, the elastic constants of γ-UMo are similar to those of body-centered cubic elemental metals.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [1];  [4];  [4];  [4]; ORCiD logo [5];  [2];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Univ. of California, Davis, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1570896
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Brubaker, Zach E., Ran, Sheng, Said, A. H., Manley, Michael E., Söderlind, P., Rosas, Debra, Idell, Yaakov, Zieve, Rena J., Butch, Nicholas P., and Jeffries, J. R. Phonon dispersion of Mo-stabilized γ-U measured using inelastic x-ray scattering. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.094311.
Brubaker, Zach E., Ran, Sheng, Said, A. H., Manley, Michael E., Söderlind, P., Rosas, Debra, Idell, Yaakov, Zieve, Rena J., Butch, Nicholas P., & Jeffries, J. R. Phonon dispersion of Mo-stabilized γ-U measured using inelastic x-ray scattering. United States. doi:10.1103/PhysRevB.100.094311.
Brubaker, Zach E., Ran, Sheng, Said, A. H., Manley, Michael E., Söderlind, P., Rosas, Debra, Idell, Yaakov, Zieve, Rena J., Butch, Nicholas P., and Jeffries, J. R. Mon . "Phonon dispersion of Mo-stabilized γ-U measured using inelastic x-ray scattering". United States. doi:10.1103/PhysRevB.100.094311.
@article{osti_1570896,
title = {Phonon dispersion of Mo-stabilized γ-U measured using inelastic x-ray scattering},
author = {Brubaker, Zach E. and Ran, Sheng and Said, A. H. and Manley, Michael E. and Söderlind, P. and Rosas, Debra and Idell, Yaakov and Zieve, Rena J. and Butch, Nicholas P. and Jeffries, J. R.},
abstractNote = {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. As a result, the elastic constants of γ-UMo are similar to those of body-centered cubic elemental metals.},
doi = {10.1103/PhysRevB.100.094311},
journal = {Physical Review B},
number = 9,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

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