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Uranium is the only element known so far to exhibit a charge-density wave (CDW) instability. The structure below the transition (T o -43 K) is complex consisting of small displacements of the atoms away from their alpha-phase equilibrium positions. It is usually assumed that this transition involves a soft phonon condensing at (or near) the CDW position in the Brillouin zone. High-resolution neutron scattering experiments at low temperature show that the principal softening occurs exactly at the CDW positions, as expected for a pure Fermi-surface instability. This result is in agreement with a recent theory, which suggests that the CDW-vector components are related to the Fermi-surface nesting topology.

Additional information

Authors: MARMEGGI J.C, CNRS Universite J Fourier, Grenoble (FR);CURRAT ET AL, Institut Laue-Langevin, Grenoble (FR);LANDER G.H, ITU, Karlsruhe (DE)
Bibliographic Reference: Article: Physica B 276-278 (2000) pp: 272-273; Oral Report European Conference on Neutron Scattering ECNS, Budapest (HU) 1-4 September, 1999
Availability: 1 as paper EN 60457 ORA
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