Abstract
Using Fe doped Au films we show that the interference effects which occur between diffusively scattered electron waves are extremely sensitive to the presence of magnetic impurities. In macroscopic films the anomalous low field magnetoconductance caused by the coherent backscattering, reflects the resonant spin-flip scattering near the Kondo temperature. For mesoscopic loops with a size comparable to the phase coherence length L φ, the direct interference between split electron waves and the coherent backscattering give rise to periodic oscillations of the magnetoconductance with flux period h/e and h/2 e, respectively. Due to the exponential damping of the oscillations, a reduction of L φ by the magnetic Fe impurities has a dramatic influence on the oscillation amplitude. At very high magnetic fields, the alignment of the impurity spins causes a partial recovery of the h/e oscillations.
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