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The resistance of small Cu0.91{Mn}0.09$ samples in the spin-glass phase showed random changes upon thermal cycling, quantitatively showing that random spin configurations affect universal conductance fluctuations. Low-frequency resistance noise showed large non-Gaussian effects, which were inconsistent with the simplest droplet models for spin glasses. A typical spin-rearrangement event involved about 10⁴ spins. Several detailed statistical parameters were measured for comparison with droplet and hierarchical models.
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Israeloff et al. (1991) studied this question.
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