Abstract

Experiments performed on mesoscopic systems made of dilute magnetic alloys ( Au Mn and Au Cr) show the effect of magnetic impurities on the Universal Conductance Fluctuations. The magnetic field allows us to switch from a low field state where the impurities are free and destroy the phase coherence to a high field state where the magnetization is saturated and the phase coherence is conserved along the whole sample. The results are interpreted by a molecular field approach in the spin glass state. However, we do not observe any jump of the conductance with time induced by spin flip in the zero field spin glass state. An explanation of the absence of jump is proposed.

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