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arXiv · 2011.01594

Strongly correlated bistable sublattice and temperature hysteresis of elastic and thermal crystal properties

A. P. Saiko·V. E. Gusakov
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Abstract

It is shown that in crystal lattices with a basis the cooperative behavior of a certain type of atoms performing optical long-wavelength vibrations in a double-well potential of the field of the matrix lattice may lead to the formation of a bistable sublattice. As a result of the interaction of the metastable states of such a sublattice with the vibrational states of the matrix lattice, the elastic and thermal properties of the crystal acquire anomalous, hysteresis-like, temperature curves. The concepts developed in the paper make it possible to obtain a qualitative interpretation, which agrees with the experimental data, of the hysteresis-like temperature dependence of the speed and absorption of ultrasonic waves, the specific heat, and the thermal conductivity in superconducting yttrium and bismuth cuprates.

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A. P. Saiko, V. E. Gusakov. 2020-11-03. Strongly correlated bistable sublattice and temperature hysteresis of elastic and thermal crystal properties. https://doi.org/10.1134/1.558959

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