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The Internal Soft‐Mode Phase Transition in Solid Biphenyl
Author(s) -
Plakida N. M.,
Belushkin A. V.,
Natkaniec I.,
Wasiutyńki T.
Publication year - 1983
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.2221180116
Subject(s) - anharmonicity , phonon , torsion (gastropod) , condensed matter physics , soft modes , biphenyl , materials science , phase transition , vibration , molecular physics , physics , chemistry , quantum mechanics , optoelectronics , medicine , surgery , organic chemistry , dielectric , ferroelectricity
The phonon dispersion curves in solid biphenyl are calculated. It is shown that the commensurate‐incommensurate phase transition is induced by mixing of anharmonic molecular torsion and acoustic phonons. The parameters of the anharmonic potential for torsion vibrations and temperature dependence of the soft mode are obtained.