Premium
Phonon Relaxation Due to Anharmonism and Central Peak in Structural Phase Transitions I. Soft Optic Modes and Acoustic Phonons in Cubic Crystals
Author(s) -
Kashcheev V. N.
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.2221170207
Subject(s) - phonon , anharmonicity , condensed matter physics , soft modes , relaxation (psychology) , physics , coupling (piping) , phase (matter) , phase transition , optics , materials science , quantum mechanics , psychology , social psychology , dielectric , ferroelectricity , metallurgy
In the mode–mode coupling approximation the critical exponente (CE) are calculated for the damping and frequency shift of soft optic modes and acoustic phonons at the structural transition point for crystals with dimensions d = 1, 2, 3. The CE are traced back to the anharmonic interaction of phonons taking into account the intrinsic dynamic central peak of any nature. Anharmonisms of all order are considered.