Volume 82, Number 2, April 2008
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||26 March 2008|
Soft phonons in -phase plutonium near the transition
Department of Physics, University of Illinois at Urbana-Champaign - 1110 W. Green Street, Urbana, IL 61801, USA
2 Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign - 104 S. Goodwin Avenue, Urbana, IL 61801, USA
3 Lawrence Livermore National Laboratory, University of California - P.O. Box 808, Livermore, CA 94551, USA
4 Advanced Photon Source, Argonne National Laboratory - Argonne, IL 60439, USA
Corresponding author: firstname.lastname@example.org
Accepted: 18 February 2008
Plutonium and its alloys exhibit complex phase diagrams that imply anomalous lattice dynamics near phase stability boundaries. Specifically, the TA  phonon branch in Ga-stabilized -Pu at room temperature shows a pronounced soft mode at the zone boundary, which suggests a possible connection to the martensitic transformation from the fcc -phase to the monoclinic -phase at low temperatures. This work is a study of the lattice dynamics of this system by X-ray thermal diffuse scattering. The results reveal little temperature dependence of the phonon frequencies, thus indicating that kinetic phonon softening is not responsible for this phase transition.
PACS: 63.20.D- – Phonon states and bands, normal modes, and phonon dispersion / 64.70.K- – Solid-solid transitions / 61.05.cf – X-ray scattering (including small-angle scattering)
© EPLA, 2008
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