Abstract
The spherical-model limitn → ∞ of then-vector model in a random field, with either a statistically independent distribution or with long-range correlated random fields, is studied to demonstrate the correctness of the replica method in which then → ∞ and replica limits limits are interchanged, provided the replica and thermodynamic limits are taken in the right order, in the case of long-range correlated random fields. A scaling form for the two-point correlation function relevant to the first-order phase transition below the lower critical dimensionality of the random system is also obtained.
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Theumann, W.K., Fontanari, J.F. The spherical-model limit in a random field. J Stat Phys 45, 99–112 (1986). https://doi.org/10.1007/BF01033080
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DOI: https://doi.org/10.1007/BF01033080