Affiliation:
1. Ioffe Physicotechnical Institute RAS
2. University of Tsukuba
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.
Publisher
Trans Tech Publications, Ltd.
Subject
Condensed Matter Physics,General Materials Science,Atomic and Molecular Physics, and Optics
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