Volume 88, Number 5, December 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||16 December 2009|
Nonlinear -model study of magnetic dephasing in a mesoscopic spin glass
Laboratoire de Physique de l'Ecole Normale Supérieure de Lyon - 46, Allée d'Italie, 69007 Lyon, France, EU
Corresponding author: David.Carpentier@ens-lyon.fr
Accepted: 16 November 2009
We propose a nonlinear sigma-model for the description of quantum transport in a mesoscopic metallic conductor with magnetic impurities frozen in a spin glass phase. It accounts for the presence of both the corresponding scalar and magnetic random potentials. In a spin glass, this magnetic random potential is correlated between different realizations. As the strength of the magnetic potential is varied, this model describes the crossover between orthogonal and unitary universality classes of the nonlinear sigma-model. We apply this technique to the calculations of the correlation of conductance between two frozen spin configurations in terms of dephasing rates for the usual low-energy modes of weak-localization theory.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 75.50.Lk – Spin glasses and other random magnets / 75.10.Nr – Spin-glass and other random models
© EPLA, 2009
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