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The element uranium, which has an orthorhombic Cmcm structure in its low-temperature alpha phase, exhibits an incommensurate charge density wave (CDW) at To = 43 K. The main component of the atomic displacements is along the a axis. The CDW is driven by a soft optic phonon mode. Neutron scattering experiments show that the phonon mode frequency follows a (T -TO)O.5, as expected in Landau theory. The experiments reported here map the three- dimensional phonon dispersion surface near To. Comparisons are made to theories discussing the origin of the CDW.

Additional information

Authors: MARMEGGI J.C, Laboratoire de Cristallographie, Grenoble Cedex (FR);CURRAT R, Institut Laue Langevin, Grenoble Cedex (FR);BOUVET A, Institut Laue Langevin, Grenoble Cedex (FR);LANDER G.H, EC-JRC, Institute for Transuranium Elements (ITU), Karlsruhe (DE)
Bibliographic Reference: An oral report given at: 1st International Symposium on Advanced Sceince Research: Advances in Neutron Scattering Research (ASR-2000). Held at: Tokai, Ibraki (JP). 31 Oct.-2 Nov. (2000)
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