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LandauaZener spin transitions in Fe2+aFe2+ quantum dots controlling dislocation mobility in NaCl:Fe crystals
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LandauaZener spin transitions in Fe2+aFe2+ quantum dots controlling dislocation mobility in NaCl:Fe crystals
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Journal Article
LandauaZener spin transitions in Fe2+aFe2+ quantum dots controlling dislocation mobility in NaCl:Fe crystals
2014
Overview
Magnetic field induces transition in the distorted Fe2+aFe2+ pairs (quantum dots) from the initial bonding singlet state to the high spin antibonding state providing decay of the pairs for two separated Fe2+ ions. Dislocations moving under internal stresses easily overcome separated Fe2+ ions in comparison with Fe2+aFe2+ pairs lying close to the glide plane. Non-monotonous field dependence of dislocation displacements under internal stresses governed by short (100 I14s) impulse of high magnetic fields up to 31 T was revealed in NaCl:Fe crystals. This non-typical dependence is the fingerprint of the LandauaZener non-adiabatic spin transition between singlet and high spin states in quantum dots distorted by mechanical stresses of moving dislocations.
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