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Anomalies of sound propagation near orientational phase transitions in antiferromagnets
Author(s) -
Mitsek A. I.,
Kolmakova N. P.,
Sirota D. I.
Publication year - 1975
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.2220720242
Subject(s) - physics , condensed matter physics , attenuation , magnetostriction , renormalization , ferromagnetism , phase (matter) , phase transition , sound (geography) , acoustic attenuation , non equilibrium thermodynamics , magnetic field , quantum mechanics , acoustics
The sound velocity and attenuation anomalies, connected with the orientational phase transitions (OPT) of first and second order, are investigated for antiferromagnets and ferromagnets. For the first order OPT the anomalies are determined by the motion of the domain walls of the transitional domain structure, while for the second order one they are determined by the interaction of the sound wave and nonequilibrium deviations of the magnetization. The consideration of the influence of the magnetic subsystem on the sound propagation is reduced to the renormalization of the elastic constants. The wave equation and general expressions for the renormalization of the elastic constants, sound velocity, and attenuation are received, taking the magnetostriction and piezomagnetism into account. The comparison of the results received and available experimental data reveals the agreement of the theory and experiments.