Specific Features of Brillouin Spectra at a High-Temperature Phase Transition in Cs₅H₃(SO₄)₄xnH₂O Crystals

Abstract:

This paper presents detailed Brillouin light scattering studies of the acoustic response of a Cs5H3(SO4)4xnH2O (PCHS) crystal in the vicinity of a superionic (superprotonic) structural phase transition of the first order. Just above the phase transition, splitting of the Brillouin doublet is observed. The ‘two-mode’ behavior of the longitudinal acoustic phonon can be explained by coexistence of phases at a structural phase transition of the first order. Above the phase transition, in the superionic phase, an additional doublet forbidden by the selection rules appears in a narrow temperature interval. It is concluded that an anomalous behavior of Brillouin light scattering can be attributed to the influence of dynamically disordered protons on the phonon subsystem.

• Periodical: Solid State Phenomena (Volume 115)
• Pages: 279-284
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.115.279
• Online since: August 2006
• Authors: A.I. Fedoseev, S.G. Lushnikov, J.H. Ko, Seiji Kojima, L.A. Shuvalov
• Keywords: Brillouin Scattering, Elastic Property, Phase Transition, Superionic Crystals

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