Incommesurate Phase Associated With The 43K Soft Phonon-Mode Displacive Transition In Alpha-U
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.
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
Record Number: 200012842 / Last updated on: 2000-11-07
Original language: en
Available languages: en