强关联双稳态亚晶格与弹性和热晶体性质的温度滞后
Strongly correlated bistable sublattice and temperature hysteresis of elastic and thermal crystal properties
摘要：
结果表明，在具有基底的晶格中，在双势阱中进行光学长波振动的原子的合作行为可能导致形成双稳态子晶格.由于这种亚晶格的亚稳态与基质晶格的振动态的相互作用，晶体的弹性和热性质获得反常的、类热膨胀的温度曲线。本文提出的概念使我们有可能对超导铜酸钇和铜酸铋中的超声波的速度和吸收、比热和热导率的温度依赖性作出与实验数据相一致的定性解释。
英文摘要：
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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