Published April 9, 2004
| Published
Journal Article
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Unusual phonon softening in delta-phase plutonium
Chicago
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Abstract
The phonon density of states and adiabatic sound velocities were measured on fcc-stabilized (242)pu(0.95)Al(0.05). The phonon frequencies and sound velocities decrease considerably (soften) with increasing temperature despite negligible thermal expansion. The frequency softening of the transverse branch along the [111] direction is anomalously large (similar to 30%) and is very sensitive to alloy composition. The large magnitude of the phonon softening is not observed in any other fcc metals and may arise from an unusual temperature dependence of the electronic structure in this narrow 5f-band metal.
Additional Information
© 2004 The American Physical Society. Received 11 June 2003; published 7 April 2004. R. J. M. thanks M. Graf, B. Harmon, M. Manley, J. Sarrao, J. Schmalian, S. Shastry, J. L. Smith, C. Stassis, J. D. Thompson, and J. Wills for valuable discussions. This research is sponsored by the United States Department of Energy National Nuclear Security Administration and by the Office of Science DE-FG03-96ER45572. The work has benefited from the use of the Los Alamos Neutron Science Center at Los Alamos National Laboratory. LANSCE is funded by the U.S. Department of Energy under Contract No. W-7405-ENG-36.Attached Files
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Additional details
- Eprint ID
- 3511
- Resolver ID
- CaltechAUTHORS:MCQprl04
- Department of Energy (DOE) National Nuclear Security Administration
- Department of Energy (DOE)
- DE-FG03-96ER45572
- Department of Energy (DOE)
- W-7405-ENG-36
- Created
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2006-06-12Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field