Lattice dynamics and phonon dispersion in Hg 2Br 2 model ferroelastic crystals

E. M. Roginskii, A. A. Kvasov, Yu F. Markov, M. B. Smirnov

Research outputpeer-review

2 Citations (Scopus)

Abstract

Interatomic force constants have been determined, acoustic and optical phonon frequencies have been calculated, phonon dispersion curves have been constructed, and the density of states in the phonon spectrum has been obtained for Hg 2Br 2 model ferroelastic crystals. The effect of hydrostatic pressure on the acoustic and optical phonon frequencies and their dispersion has been theoretically analyzed. It is established that an increase in the pressure leads to significant softening of the slowest acoustic TA branch (soft mode) at the X point of the Brillouin zone, which agrees with the phenomenological Landau theory of phase transitions and is consistent with the available experimental data.

Original languageEnglish
Pages (from-to)361-364
Number of pages4
JournalTechnical Physics Letters
Volume38
Issue number4
DOIs
Publication statusPublished - Apr 2012

Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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