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

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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.

Info:

Periodical:

Solid State Phenomena (Volume 115)

Edited by:

B.M. Darinskii and L.B. Magalas

Pages:

279-284

DOI:

10.4028/www.scientific.net/SSP.115.279

Citation:

A.I. Fedoseev et al., "Specific Features of Brillouin Spectra at a High-Temperature Phase Transition in Cs5H3(SO4)4xnH2O Crystals", Solid State Phenomena, Vol. 115, pp. 279-284, 2006

Online since:

August 2006

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$35.00

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