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- W2069183794 abstract "We report an observation of aperiodic magnetoresistance fluctuations in an amorphous system. We have observed fluctuations in amorphous ${mathrm{Pd}}_{80}$${mathrm{Si}}_{20}$ wires with macroscopic lengths, up to L=1 mm (L/${mathit{L}}_{mathit{c}mathit{p}mathit{h}mathit{i}}$=12 000, where ${mathit{L}}_{mathit{c}mathit{p}mathit{h}mathit{i}}$ is the phase-coherence length). The root-mean-square amplitude of the resistance fluctuations is proportional to ${mathit{L}}^{1/2}$, in agreement with theory. We observe a reduction in the fluctuation amplitude at low magnetic fields, which we attribute to magnetic scattering, possibly in the Kondo regime. Two simple models are presented to describe this behavior, one based on a single population of magnetic scatterers with temperature-dependent magnetic moment, and the other based on two scatterer populations, each with fixed moment. Both models agree with the data. We use the high-field amplitude of the magnetoresistance-fluctuation structure to predict the characteristic field scale; the prediction is larger than the observed field scale by a factor of 2." @default.
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- W2069183794 date "1991-05-15" @default.
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- W2069183794 title "Quantum magnetoresistance fluctuations in an amorphous metal" @default.
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- W2069183794 doi "https://doi.org/10.1103/physrevb.43.12267" @default.
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