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The High-Temperature Phonon Anomalies of α-uranium.

Published online by Cambridge University Press:  17 May 2012

Peter S. Riseborough
Peter S. Riseborough*
Affiliation:
Department of Physics, Temple University, Philadelphia, Pa 19122, USA.
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Abstract

There is a growing body of evidence that a number of mixed-valent and heavy-fermion materials show renormalized hybridization gaps either at the Fermi-energy or close to the Fermi-energy. In the former case, a heavy-fermion semiconducting state occurs and in the later case, the system remains metallic at low temperatures. The magnitudes of the hy-bridization gaps are observed to decrease with increasing temperature. The existence of a low-energy electronic energy scale creates a possibility that the Born-Oppenheimer ap-proximation may fail and that there may be a resonant coupling between the phonons and the electronic excitations. Here we argue that such a mechanism may be the cause of the phonon anomalies observed in neutron scattering experiments on the high-temperature phase of alpha-uranium.

Keywords

electron-phonon interactionsneutron scatteringactinide

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Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1444: Symposium S/Y – Actinides and Nuclear Energy Materials , 2012, mrss12-1444-y05-01
Copyright
Copyright © Materials Research Society 2012

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