CDW-gaps, soft-phonons and physical transitions in bulk single crystal of alpha-Uranium

International Conference on Strongly Correlated Electron Systems 2014

Marmeggi, J.-C.^1,2 ; Haen, P.^1 ; Filhol, A.^2 ; Bastie, P.^2,3

Institut Néel CNRS, University Grenoble Alpes, BP 166, Grenoble cedex 9

F-38042, France^1

Institut Laue Langevin, CS 20156, Grenoble cedex 9

F-38042, France^2

LIphy UMR5588, University Grenoble Alpes, BP 87, St.-Martin d'Hères cedex

F-38402, France^3

关键词: Bulk single crystals;    Laue diffraction;    Lower temperatures;    Periodic lattices;    Physical quantities;    Structural behaviour;    Superconductivity transitions;    Very low temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012035/pdf
DOI  :  10.1088/1742-6596/592/1/012035

来源: IOP

【 摘 要 】

An overview of three decades of studies of the low temperature structural behaviour of the bulk of alpha-Uranium (α-U) is presented. Combining high-resolution elastic and inelastic neutron scattering made it possible to observe and study, down to 5 K, the structural and lattice dynamical aspects of a series of three charge-density waves (CDWs) transition (43, 37 and 22 K). However at lower temperatures several physical quantities show anomalies such as a controversial superconductivity transition. This stresses the need for extra structural data down to very low temperatures. While this would be a challenge with neutrons due to fission sample heating, a new opportunity is offered by low temperature Laue diffraction with hard X- rays. For example a full locking of the periodic lattice distortion (PLD) can be expected related to the evolution of the CDW and/or the appearance of a SDW, this might help understand the physical behaviour of the material and clarify the role of sample impurities.