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Uranium is the only element known so far to exhibit a charge-density wave instability. The structure below the transition is complex consisting of small displacements of the atoms away from their alpha-phase equilibrium position structure. It is usually assumed that this transition involves a soft-phonon condensing at the CDW position in the brillouin zone. High-resolution neutron scattering experiments at low temperatures 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

Bibliographic Reference: Paper presented: European conference n neutron Scattering ECNS, Budapest (HU), 1-4th September (1999)
Availability: Available from Public Relations and Publications Unit, Ispra (IT)
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