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Universal conductance fluctuations and low-temperature 1/f noise in mesoscopic AuFe spin glasses

URN to cite this document:
urn:nbn:de:bvb:355-epub-35124
Neuttiens, G. ; Strunk, Christoph ; Van Haesendonck, C. ; Bruynseraede, Y.
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Date of publication of this fulltext: 05 Aug 2009 13:43


Abstract

We report on intrinsic time-dependent conductance fluctuations observed in mesoscopic AuFe spin-glass wires. These dynamical fluctuations have a 1/f-like spectrum and appear below the measured spin-glass freezing temperature of our samples. The dependence of the fluctuation amplitude on temperature, magnetic field, voltage, and Fe concentration allows a consistent interpretation in terms of quantum interference effects, that are sensitive to the slowly fluctuating spin configuration.


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