Evidence for a Quasi-Two-Dimensional Proton Glass State inCs5H3(SO4 | Zendy

S. G. Lushnikov | Zendy; S. N. Gvasaliya | Zendy; A. I. Fedoseev | Zendy; V. Hugo Schmidt | Zendy; G. F. Tuthill | Zendy; L. A. Shuvalov | Zendy

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Evidence for a Quasi-Two-Dimensional Proton Glass State inCs5H3(SO4

Author(s) -

S. G. Lushnikov,

S. N. Gvasaliya,

A. I. Fedoseev,

V. Hugo Schmidt,

G. F. Tuthill,

L. A. Shuvalov

Publication year - 2001

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.86.2838

Subject(s) - state (computer science) , computer science , physics , algorithm

We describe damping of hypersonic and ultrasonic longitudinal acoustic (LA) phonons in crystals of Cs 5H (3)(SO (4))(4);xH 2O (PCHS) between 100 and 360 K. The damping of LA phonons exhibits strong dispersion caused by relaxation processes in the region of transformation into the glasslike phase (T(g) approximately 260 K). Near T(g) the damping of ultrasonic phonons propagating in the basal plane reflects the cooperative freezing of acid protons. The damping of LA phonons propagating perpendicular to the basal plane can be fit by the Debye model and is due to the interaction between protons and LA phonons. This suggests that the proton glass state that is realized at T<T(g) has a quasi-two-dimensional nature.

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