Open AccessMicroprocesses at Second-Order Phase Transitions in Crystals with Strong Interband Electron-Phonon Interaction
Author(s) -
É. N. Myasnikov,
Z. P. Mastropas
Publication year - 2022
Publication title -
ukrainian journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.213
H-Index - 17
eISSN - 2071-0194
pISSN - 2071-0186
DOI - 10.15407/ujpe56.10.1030
Subject(s) - condensed matter physics , phase transition , phonon , crystal (programming language) , electron , landau theory , phase (matter) , physics , order (exchange) , materials science , quantum mechanics , finance , computer science , economics , programming language
A system of strongly interacting electrons and phonons in a crystal has been considered. If the temperature changes, the systemundergoes changes equivalent to those occurring at the phase transition of the second kind, when the equilibrium positions of atoms become shifted. It has been demonstrated that the expansion of the thermodynamic potential in a series in the order parameter, which is a standard routine in the Landau phenomenological theory, can lead to equilibrium states that do not correspond to any real state of the crystal. It has also been shown that, in the course of phase transitions that occur with varying temperature, the deformation energy is released in the form of Barkhausen-like pulses.