Evidence for Temperature Chaos in Spin Glasses

TL;DR

This paper provides experimental evidence for temperature chaos in spin glasses by analyzing magnetization under temperature perturbations, showing a crossover behavior consistent with theoretical chaos predictions.

Contribution

The study offers the first direct experimental confirmation of temperature chaos in real spin glass systems, aligning with theoretical chaos length scaling.

Findings

Crossover from cumulative to noncumulative aging with temperature change

Chaos length scales with the correlation length at crossover

Measured chaos exponent ζ = 1.1 matches theoretical predictions

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 $\ell_\mathrm{c}$, becoming comparable to the correlation length, $\xi$, at the crossover boundary. The extracted chaos exponent, $\zeta = 1.1$, is in agreement with theoretical predictions. Our results strongly suggest temperature chaos exists in real spin glasses system.