Abstract
A magnetic induction threshold B c above which the magnetoplastic effect — depinning of dislocations from paramagnetic pinning centers — can be observed in samples placed in a magnetic field is predicted and observed in Al, NaCl, and LiF crystals. The existence of a threshold is associated with the fact that for B<B c the spin-lattice relaxation time τsl in a dislocation-paramagnetic-center system is less than the time required for spin evolution in a magnetic field resulting in the removal of the spin forbiddenness of an electronic transition that “switches off” the dislocation-pinning-center interaction. It is shown that the threshold field B c is sensitive to temperature and x-ray irradiation of the samples. A new method for measuring the spin-lattice relaxation time in paramagnetic centers on dislocations is proposed on the basis of the data obtained.
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Pis’ma Zh. Éksp. Teor. Fiz. 63, No. 8, 628–633 (25 April 1996)
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Al’shits, V.I., Darinskaya, E.V., Kazakova, O.L. et al. Magnetoplastic effect and spin-lattice relaxation in a dislocation-paramagnetic-center system. Jetp Lett. 63, 668–673 (1996). https://doi.org/10.1134/1.567085
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DOI: https://doi.org/10.1134/1.567085