Abstract
Abstract The electron spin-lattice relaxation time T1 of paramagnetic defects responses very sensitively to structural phase transitions. The investigation of the electron spin-lattice relaxation time T2 in ferroelectric and ferroelastic crystals shows a characteristic anomaly at the phase transition temperature Tc. The continuous increase of T1 at a second order phase transition can uniformly be explained with the assumption that a non-critical optical mode is anomalously damped. In the case of a first order phase transition a discontinuous jump of the spin-lattice relaxation time is observed.
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