Anomalous optical and electronic properties of dense sodium

A. Lazicki, A. F. Goncharov, V. V. Struzhkin, R. E. Cohen, Z. Liu, E. Gregoryanz, C. Guillaume, H. -K. Mao, Russell J. Hemley

Research output: Contribution to journalArticlepeer-review

Abstract

Synchrotron infrared spectroscopy on sodium shows a transition from a high reflectivity, nearly free-electron metal to a low-reflectivity, poor metal in an orthorhombic phase at 118 GPa. Optical spectra calculated within density functional theory (DFT) agree with the experimental measurements and predict a gap opening in the orthorhombic phase at compression beyond its stability field, a state that would be experimentally attainable by appropriate choice of pressure-temperature path. We show that a transition to an incommensurate phase at 125 GPa results in a partial recovery of good metallic character up to 180 GPa, demonstrating the strong relationship between structure and electronic properties in sodium.

Original languageEnglish
Pages (from-to)6525-6528
Number of pages4
JournalProceedings of the National Academy of Sciences
Volume106
Issue number16
DOIs
Publication statusPublished - 21 Apr 2009

Cite this