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We propose a mechanism for negative isotropic magnetoresistance in thehopping regime. It results from a memory effect encrypted into spincorrelations that are not taken into account by the conventional theory ofhopping conductivity. The spin correlations are generated by the nonequilibriumelectric currents and lead to the decrease of the conductivity. The applicationof the magnetic field destroys the correlations thus enhancing the conductance.This effect can occur even at magnetic fields as small as a few gauss.

Spin-memory effect and negative magnetoresistance in hopping conductivity