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Phonons and their dispersion in model ferroelastics Hg2Hal2

  • Proceedings of the XIX All-Russian Conference on Physics of Ferroelectrics (VKS-XIX)
  • (Moscow, Russia, June 19–23, 2011)
  • Published:
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Abstract

Dispersion relations of the acoustic and optical phonon frequencies have been calculated and plotted, and the density of states of the phonon spectrum of Hg2Cl2 and Hg2Br2 crystals has been derived. The effect of hydrostatic pressure on the frequencies of acoustic and optical phonons and their dispersion has been theoretically analyzed. It has been found that an increase in the pressure leads to a strong softening of the slowest acoustic TA branch (the soft mode) at the X point of the Brillouin zone boundary, which is consistent with the phenomenological Landau theory and correlates with experiment.

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Authors and Affiliations

  1. Ioffe Physical-Technical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia

    E. M. Roginskii & Yu. F. Markov

  2. St. Petersburg State University, Universitetskaya nab. 7-9, St. Petersburg, 199034, Russia

    A. A. Kvasov & M. B. Smirnov

Authors
  1. E. M. Roginskii
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  2. A. A. Kvasov
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  3. Yu. F. Markov
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  4. M. B. Smirnov
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Correspondence to E. M. Roginskii.

Additional information

Original Russian Text © E.M. Roginskii, A.A. Kvasov, Yu.F. Markov, M.B. Smirnov, 2012, published in Fizika Tverdogo Tela, 2012, Vol. 54, No. 5, pp. 849–852.

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Roginskii, E.M., Kvasov, A.A., Markov, Y.F. et al. Phonons and their dispersion in model ferroelastics Hg2Hal2 . Phys. Solid State 54, 900–904 (2012). https://doi.org/10.1134/S1063783412050356

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  • DOI: https://doi.org/10.1134/S1063783412050356

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