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Low-temperature structural phase transitions: Phonon-like and relaxation order-parameter dynamics

A. Cano·A. P. Levanyuk
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Abstract

A theoretical study on low-temperature structural phase transitions is presented, in which both phonon-like and relaxation order-parameter dynamics are contemplated. While the first limiting case has been considered previously, the second one is studied here for the first time. Attention is put on the low-temperature asymptotics of the temperature dependence of the generalized susceptibility. In the relaxation case, it is found $\sim (T^2 - T_c^2)^{-1}$ for temperature-independent relaxation times in a broad region of the temperature-pressure phase diagram. In contrast to the obtained in the phonon-like case, this asymptotics is not modified by long-range interactions (dipolar forces, piezoelectric effect, etc.).

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BibTeXRIS

A. Cano, A. P. Levanyuk. 2004-04-06. Low-temperature structural phase transitions: Phonon-like and relaxation order-parameter dynamics. https://doi.org/10.1103/physrevb.70.064104

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