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Spin glasses in the limit of an infinite number of spin components
Phys. Rev. E 71, 036146 – Published 28 March, 2005
DOI: https://doi.org/10.1103/PhysRevE.71.036146
Abstract
We consider spin glass models in which the number of spin components is infinite. In the formulation of the problem appropriate for numerical calculations proposed by several authors, we show that the order parameter defined by the long-distance limit of the correlation functions is actually zero and there is only “quasi-long-range order” below the transition temperature. Nonetheless, there can be a finite temperature phase transition where the decay of correlations changes from exponential to power law. We also show that the spin glass transition temperature is zero in three dimensions so power-law behavior only occurs at in this case. We also argue that the order of limits, and is important, where is the number of spins.
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