Lattice Dynamics of Dense Lithium

F. A. Gorelli, S. F. Elatresh, C. L. Guillaume, M. Marqués, G. J. Ackland, M. Santoro, S. A. Bonev, and E. Gregoryanz
Phys. Rev. Lett. 108, 055501 – Published 30 January 2012
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Abstract

We report low-frequency high-resolution Raman spectroscopy and ab-initio calculations on dense lithium from 40 to 200 GPa at low temperatures. Our experimental results reveal rich first-order Raman activity in the metallic and semiconducting phases of lithium. The computed Raman frequencies are in excellent agreement with the measurements. Free energy calculations provide a quantitative description and physical explanation of the experimental phase diagram only when vibrational effect are correctly treated. The study underlines the importance of zero-point energy in determining the phase stability of compressed lithium.

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  • Received 14 June 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.055501

© 2012 American Physical Society

Authors & Affiliations

F. A. Gorelli1,2, S. F. Elatresh3, C. L. Guillaume4, M. Marqués4,‡, G. J. Ackland4, M. Santoro1,5, S. A. Bonev3,6,*, and E. Gregoryanz4,†

  • 1LENS, European Laboratory for Non-Linear Spectroscopy, University of Florence, I-50121 Florence, Italy
  • 2IPCF-CNR, UOS Roma, Piazzale Aldo Moro 5, 00185 Roma, Italy
  • 3Department of Physics, Dalhousie University, Halifax, Nova Scotia B3H 3J5, Canada
  • 4SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh, EH9 3JZ, United Kingdom
  • 5IFAC-CNR, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy
  • 6Lawrence Livermore National Laboratory, Livermore, California 94550, USA

  • *stanimir.bonev@dal.ca bonev@llnl.gov
  • e.gregoryanz@ed.ac.uk
  • Present address: Departamento de Química Física y Analítica, Universidad de Oviedo, E-33006 Oviedo, Spain.

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Issue

Vol. 108, Iss. 5 — 3 February 2012

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