Optical and electronic properties of dense sodium

Miriam Marques, Mario Santoro, Christophe L. Guillaume, Federico A. Gorelli, Julia Contreras-Garcia, Ross T. Howie, Alexander F. Goncharov, Eugene Gregoryanz

Research output: Contribution to journalArticlepeer-review

Abstract

High-resolution Raman spectroscopy of dense sodium reveals additonal low-energy lattice excitations in the three high-pressure phases cI 16, oP 8, and tI 19 from 108 to 178 GPa. The Raman-active lattice modes indicate profound changes of the chemical bonding in Na upon its transformation to an insulating state (hP 4 phase) at pressures above 178( 2) GPa. The calculated values of the valence electron localization maxima versus pressure provide insights into the experimentally observed solid-solid phase transitions and anomalous melting behavior of sodium.

Original languageEnglish
Article number184106
Number of pages7
JournalPhysical review B: Condensed matter and materials physics
Volume83
Issue number18
DOIs
Publication statusPublished - 17 May 2011

Keywords

  • HIGH-PRESSURE PHASES
  • RAMAN-SPECTROSCOPY
  • LITHIUM
  • METALS
  • GPA
  • SUPERCONDUCTIVITY
  • PSEUDOPOTENTIALS
  • TRANSITION

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