Phonon Localization by Mass Disorder in Dense Hydrogen-Deuterium Binary Alloy

Ross T. Howie, Ioan B. Magdau, Alexander F. Goncharov, Graeme J. Ackland, Eugene Gregoryanz

Research output: Contribution to journalArticlepeer-review

Abstract

Using a combination of the Raman spectroscopy and density functional theory calculations on dense hydrogen-deuterium mixtures of various concentrations, we demonstrate that, at 300 K and above 200 GPa, they transform into phase IV, forming a disordered binary alloy with six highly localized intramolecular vibrational (vibrons) and four delocalized low-frequency (<1200 cm(-1)) modes. Hydrogen-deuterium mixtures are unique in showing a purely mass-induced localization effect in the quantum solid: chemical bonding is isotope-independent while the mass varies by a factor of 2.

Original languageEnglish
Article number175501
Number of pages5
JournalPhysical Review Letters
Volume113
Issue number17
Early online date21 Oct 2014
DOIs
Publication statusPublished - 24 Oct 2014

Keywords

  • ANDERSON LOCALIZATION
  • RAMAN-SPECTRA
  • DIFFUSION
  • ABSENCE

Cite this