Abstract
The anomalous behaviour of ultrasonic and hypersonic velocities in the vicinity of the ferroelastic (superprotonic) phase transition (FSPT) of a model ferroelastic-superprotonic crystal of Rb3H(SeO4)2 can found the explanation on the basis of the model of FSPT induced proton disorder. The background of the model under consideration is changes in the cooperative behaviour of the system of hydrogen bonds in the vicinity of FSPT due to the critical change in the indirect proton-proton interaction via the soft mode of the improper ferroelastic phase transition. As a result of the oscillation character of this indirect interaction the chaotic proton phase appears in the vicinity of FSPT. The interaction between corresponding tunnel cooperative and low energy proton excitations in the chaotic proton phase and the acoustical mode leads to principally different critical behaviours of ultrasonic and hypersonic velocities in the vicinity of FSPT.
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