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The Effect of Relaxing Defects on the Spin—Lattice Relaxation at Ferroelectric Phase Transitions
Author(s) -
Geppert U.,
Kühnel A.
Publication year - 1984
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.2221240106
Subject(s) - condensed matter physics , anharmonicity , curie temperature , ferroelectricity , phase transition , lattice (music) , relaxation (psychology) , materials science , curie , spin–lattice relaxation , physics , ferromagnetism , nuclear quadrupole resonance , psychology , social psychology , acoustics , optoelectronics , dielectric
Spin—lattice relaxation times are calculated near the phase transition for a uniaxial ferroelectric containing defects. The defects are assumed to couple linearly to the order parameter. Defects and order parameter are of relaxator type. The corresponding Langevin equations are given and solved with help of perturbation theory for small anharmonicity and weak influence of the randomly located defects on the Curie temperature. It is found that the experimentally observed opposite anomalies of the spin—lattice relaxation times in TGS can be understood for definite values of the defect parameter.