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Electron spin‐echo (ESE) investigations of critical paramagnetic relaxation anomalies in X‐irradiated triglycine sulphate (TGS:X)
Author(s) -
Völkel G.,
Brunner W.,
Windsch W.,
Steudel D.
Publication year - 1979
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.2220950111
Subject(s) - condensed matter physics , ferroelectricity , phase transition , relaxation (psychology) , electron paramagnetic resonance , irradiation , spin–lattice relaxation , paramagnetism , electron , nuclear magnetic resonance , chemistry , materials science , physics , dielectric , nuclear physics , optoelectronics , psychology , social psychology
The relaxation behaviour of a stable free radical in X‐irradiated triglycine sulphate is investigated by means of the electron spin‐echo method in the vicinity of the ferroelectric phase transition. A critical behaviour of the transverse relaxation as well as of the longitudinal relaxation is detected. The critical shortening of the phase memory time T M can be explained by the order parameter fluctuations at the phase transition of TGS. To the contrary the spin–lattice relaxation time T 1 critically increases at the phase transition. This unusual behaviour cannot be understood on the basis of a direct interaction with the order parameter fluctuations via direct relaxation processes but points at a coupling of the acoustic lattice modes to the ferroelectric relaxational mode.