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Lattice Dynamics and Baric Behavior of Phonons in the Hg2Br2 Model Ferroelastics

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Abstract

Raman spectra of Hg2Br2 model improper ferroelastic crystals have been investigated in a wide range of high hydrostatic pressures. Baric dependences of the phonon frequencies have been obtained; of greatest interest are the observed soft mode originating from the slowest TA1 acoustic branch at the Brillouin zone boundary (X point) of the tetragonal phase and the anomalous behavior of this mode. In the ferroelastic phase spectra, the ignition of the second acoustic TA2 from the same point has also been detected and its baric behavior has been studied. Under sufficiently high pressures, splitting of doubly degenerate phonons with the Eg symmetry has been observed and explained. The parameters of the Grüneisen constants have been determined from the baric dependences of the phonon frequencies and discussed.

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ACKNOWLEDGMENTS

This study was supported by the Presidium of the Russian Academy of Sciences, Programs no. 1.4 “Urgent Problems of Low-Temperature Physics” and no. 1.7 “Physics of Condensed Matter and New-Generation Materials.”

The authors are grateful to Yu.E. Kitaev for fruitful discussions.

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Authors and Affiliations

  1. Ioffe Institute, 194021, St. Petersburg, Russia

    E. M. Roginskii & Yu. F. Markov

  2. Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, 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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Translated by E. Bondareva

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Roginskii, E.M., Krylov, A.S. & Markov, Y.F. Lattice Dynamics and Baric Behavior of Phonons in the Hg2Br2 Model Ferroelastics. Phys. Solid State 61, 187–191 (2019). https://doi.org/10.1134/S1063783419020227

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  • DOI: https://doi.org/10.1134/S1063783419020227

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