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Isotopic effect in Brillouin light-scattering spectra of a Cs5H3(SO4)4 · xH2O crystal

  • Lattice Dynamics and Phase Transitions
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Abstract

A Brillouin scattering study of the behavior of hypersonic longitudinal acoustic phonons in crystalline pentacesium trihydrogen tetrasulfate Cs5H3(SO4)4 · xH2O (PCHS) and its deuterated analog Cs5D3(SO4)4 · xD2O (DPCHS) at temperatures ranging from 420 to 120 K is reported. The effect of deuteration on the crystal lattice dynamics is investigated. The differences in the behavior of hypersonic acoustic phonons in the PCHS and DPCHS crystals suggest the existence of a hydrogen isotope effect in both the high-and low-temperature phases. A possible model of the isotopic effect in the high-temperature phase is discussed. An analysis is made of the acoustic response of the PCHS and DPCHS crystals in the region of the transition to the glasslike phase.

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Authors and Affiliations

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

    S. G. Lushnikov & A. I. Fedoseev

  2. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 117333, Russia

    L. A. Shuvalov

Authors
  1. S. G. Lushnikov
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  2. A. I. Fedoseev
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  3. L. A. Shuvalov
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__________

Translated from Fizika Tverdogo Tela, Vol. 42, No. 12, 2000, pp. 2197–2204.

Original Russian Text Copyright © 2000 by Lushnikov, Fedoseev, Shuvalov.

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Lushnikov, S.G., Fedoseev, A.I. & Shuvalov, L.A. Isotopic effect in Brillouin light-scattering spectra of a Cs5H3(SO4)4 · xH2O crystal. Phys. Solid State 42, 2265–2272 (2000). https://doi.org/10.1134/1.1332150

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  • DOI: https://doi.org/10.1134/1.1332150

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