A model for spin glasses is proposed in which spins whose RKKY interactions exceed thermal energies define magnetic clusters. Percolation theory determines the spin glass temperature T g below which an infinite cluster forms. With suitable anisotropy assumptions the infinite cluster will be superparamagnetically blocked, giving a cusped susceptibility at T g . A collinear distribution in each cluster gives an effectively one-dimensional internal field at low temperatures. The model predicts Blandin-Souletie scaling at all temperatures and a T -1 specific heat tail.
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David A. Smith (1974) studied this question.
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