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

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

2004-04-06

arxiv.org/abs/cond-mat/0404140v1

Phys. Rev. B 70, 064104 (2004).

Physics

Condensed Matter

Statistical Mechanics

9 pages

Scientific paper

10.1103/PhysRevB.70.064104

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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