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Springer series in solid-state sciences

Recent Experimental Results in Spin-Glass Dynamics

N. Bontemps

Published Jan 1, 1987• 1 citation
Publisher
DOI
10.1007/978-3-642-83033-4_31

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In this response we reply to the criticism of Nordblad et al. on our measurements of the dynamic repsonse of dilute metallic spin glasses. We argue that we have, in our experiments on dilute metallic spin glasses, separated the thermalization dynamics from the dynamic response to a change in applied field. This is contrary to experiments with observation times that exceed the characteristic thermalization time. On the basis of this observation we show that our interpretation of our experimental results is completely consistent with a recent model calculation of the dynamic response of the infinite-range Ising spin-glass model.

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We have performed a detailed analysis of the local dynamics and local energies of the equilibrium, paramagnetic phase of the d = 2 and d = 3 ±J Ising spin glass model. Here we discuss our recently reported observations1) that while the average flip rate and average energy decrease monotonically with decreasing temperature, both the flip rate and energy of an increasing fraction of spins increase as the glass transition is approached on cooling. These findings are consistent with recent experimental results for the frequency-dependent magnetic susceptibility of an insulating spin glass, which showed that the approach to the glass transition could be detected from the high frequency behavior.
Some recent experiments on the non‐equilibrium dynamics in two‐ and three‐dimensional spin glasses are reviewed. The experimental results are discussed within new domain (droplet) theories of the spin glass phase. It is found that the experiments convincingly verify some fundamental concepts of these theories. Especially, it is shown that if a spin glass has been ‘‘aged’’ at constant temperature and afterwards subjected to a persistent temperature shift or a temperature cycling, the dynamics are governed by an interplay between the growth of spin glass domains and the overlap length, which is the maximum length scale where equilibrium spin correlations at two nearby temperatures are indistinguishable.
In this response we reply to the criticism of Nordblad et al. on our measurements of the dynamic repsonse of dilute metallic spin glasses. We argue that we have, in our experiments on dilute metallic spin glasses, separated the thermalization dynamics from the dynamic response to a change in applied field. This is contrary to experiments with observation times that exceed the characteristic thermalization time. On the basis of this observation we show that our interpretation of our experimental results is completely consistent with a recent model calculation of the dynamic response of the infinite-range Ising spin-glass model.