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Structural phase transitions of antiferroelectric and displacive modulated types caused by electron‐phonon interaction
Author(s) -
Konsin P.
Publication year - 1978
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220860106
Subject(s) - anharmonicity , condensed matter physics , ferroelectricity , antiferroelectricity , phonon , phase transition , dielectric , soft modes , dispersion relation , lattice (music) , electron , materials science , phase (matter) , physics , quantum mechanics , acoustics
A generalization of the vibronic theory of ferroelectric phase transitions is made and the theory of antiferroelectric and structural modulated phase transitions, caused by the electron‐phonon interaction in dielectrics and semiconductors, is developed. The criteria for the occurrence of such transitions are obtained. The basic characteristics (spontaneous lattice distortion, dielectric susceptibility, frequencies of soft modes, etc.) are calculated. The dispersion of electronic states, corrections to the mean field approximation for the driving vibronic interaction, and phonon anharmonicity are taken into account. The relation between ferroelectric and antiferroelectric phase transitions is discussed.