This article is cited in 4 papers

Impurity centers

Generation modes of Eu$^{2+}$ nonequilibrium dimers and influence of a magnetic field on their reconstruction in NaCl: Eu crystals

R. B. Morgunov

Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

Abstract: Three generation modes have been experimentally revealed for impurity-vacancy Eu$^{2+}$ dimers with the atomic structure determined by the spin-selective transitions to equilibrium configurations in a constant magnetic field of 5–15 T in NaCl: Eu crystals. It has been shown that, under conditions of linearly increasing mechanical stresses, the plastic strain of the NaCl: Eu crystals accelerates the aggregation of impurities and generates magnetically sensitive dimers several tens of times more rapidly than in the case of diffusion-controlled aggregation. Under conditions of linearly increasing strains, magnetically sensitive dimers arise as a result of the destruction of impurity precipitates by moving dislocations. The identification of dimers and the determination of their average spin in the process of spin-dependent reorganization of the atomic structure of the dimers have been performed using optical spectroscopy and SQUID magnetometry.

Received: 21.04.2010
Accepted: 16.09.2010

 English version: Physics of the Solid State, 2011, 53:4, 786–798

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