Abstract
A new cluster-effective-field theory of spin glasses is formulated. Basic formulas for the spin-glass transition point and the spin-glass susceptibility in the high-temperature phase are obtained. The present theory combined with the coherent-anomaly method is shown to be useful to estimate the true critical point and the nonclassical critical exponent of a spin-glass transition. Concerning the two-dimensional ±J model, we have γ s =5.2(1) forT SG=0, which agrees well with the data by some other authors. As for the threedimensional±J model, the present tentative analysis givesT SG=1.2(1)(J/k B) and γ s =4(1), but more extensive calculations are needed.
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Hatano, N., Suzuki, M. Effective-field theory of spin glasses and the coherent-anomaly method. I. J Stat Phys 63, 25–46 (1991). https://doi.org/10.1007/BF01026590
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DOI: https://doi.org/10.1007/BF01026590