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

Ross T. Howie, Ioan B. Magdău, Alexander F. Goncharov, Graeme J. Ackland, and Eugene Gregoryanz
Phys. Rev. Lett. 113, 175501 – Published 21 October 2014
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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  cm1) 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.

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  • Received 23 June 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.175501

© 2014 American Physical Society

Authors & Affiliations

Ross T. Howie1, Ioan B. Magdău1, Alexander F. Goncharov2, Graeme J. Ackland1, and Eugene Gregoryanz1,*

  • 1School of Physics and Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
  • 2Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015, USA

  • *e.gregoryanz@ed.ac.uk

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Vol. 113, Iss. 17 — 24 October 2014

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