Edinburgh Research Explorer

Lattice Dynamics and Superconductivity in Cerium at High Pressure

Research output: Contribution to journalArticle

Related Edinburgh Organisations

Open Access permissions

Open

Documents

http://prl.aps.org/abstract/PRL/v108/i4/e045502
Original languageEnglish
Article number045502
Number of pages5
JournalPhysical Review Letters
Volume108
Issue number4
DOIs
StatePublished - 24 Jan 2012

Abstract

We have measured phonon dispersion relations of the high-pressure phase cerium-oC(4) (alpha' phase with the alpha-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 alpha-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.

    Research areas

  • CHARGE-DENSITY-WAVE, ALPHA-GAMMA-TRANSITION, KONDO VOLUME-COLLAPSE, X-RAY, URANIUM, PHASE, CRYSTAL, PHONON, METAL, TEMPERATURE

Download statistics

No data available

ID: 1387572