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Effects of Pressure-Induced Phase Transition in Model Hg2Br2 Ferroelastics

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Abstract

Raman spectra of model improper ferroelastics (Hg2Br2 crystals) have been analyzed in a wide range of hydrostatic pressures. The baric dependences of the phonon frequencies are obtained. The revealing and anomalous behavior of the soft mode, which is genetically related to the acoustic phonon (ТА1) at the Brillouin zone boundary (point X) of the tetragonal phase, are most interesting. The buildup of the second acoustic phonon (ТА2) from the same point has also been found in the ferroelastic-phase spectra, and its baric behavior has been investigated. The splitting of doubly degenerate phonons of the Eg symmetry has been revealed at fairly high pressures and explained.

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Authors and Affiliations

  1. Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia

    E. M. Roginskii & Yu. F. Markov

  2. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia

    A. S. Krylov

Authors
  1. E. M. Roginskii
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  2. A. S. Krylov
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  3. Yu. F. Markov
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Correspondence to E. M. Roginskii.

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Original Russian Text © E.M. Roginskii, A.S. Krylov, Yu.F. Markov, 2018, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2018, Vol. 44, No. 17, pp. 3–10.

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Roginskii, E.M., Krylov, A.S. & Markov, Y.F. Effects of Pressure-Induced Phase Transition in Model Hg2Br2 Ferroelastics. Tech. Phys. Lett. 44, 757–760 (2018). https://doi.org/10.1134/S1063785018090110

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  • DOI: https://doi.org/10.1134/S1063785018090110

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