Document Detail

Lattice dynamics and superconductivity in cerium at high pressure.
MedLine Citation:
PMID:  22400861     Owner:  NLM     Status:  In-Data-Review    
We have measured phonon dispersion relations of the high-pressure phase cerium-oC4 (α^{'} phase with the α-uranium crystal structure) at 6.5 GPa by using inelastic x-ray scattering. Pronounced phonon anomalies are observed, which are remarkably similar to those of α-U. First-principles electronic structure calculations reproduce the anomalies and allow us to identify strong electron-phonon coupling as their origin. At the low-pressure end of its stability range, Ce-oC4 is on the verge of a lattice-dynamical instability and possibly a charge density wave. The superconducting transition temperatures of the fcc, oC4, and mC4 phases of Ce have been calculated, and the superconductivity observed experimentally by Wittig and Probst is attributed to the oC4 phase.
I Loa; E I Isaev; M I McMahon; D Y Kim; B Johansson; A Bosak; M Krisch
Publication Detail:
Type:  Journal Article     Date:  2012-01-24
Journal Detail:
Title:  Physical review letters     Volume:  108     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-03-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  045502     Citation Subset:  IM    
SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh, United Kingdom.
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