Evidence for Temperature Chaos in Spin Glasses
Abstract
We study the field cooled magnetization of a CuMn spin glass under temperature perturbations. The T-cycling curves are compared with the reference curve without temperature cycling. There is a crossover from the cumulative aging region to noncumulative aging region as the temperature change is increased. The cumulative aging range scales with the chaos length c, becoming comparable to the correlation length, , at the crossover boundary. The extracted chaos exponent, ζ = 1.1, is in agreement with theoretical predictions. Our results strongly suggest temperature chaos exists in real spin glasses system.
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