On two renormalised effective field theories

P.B. Fynbo

Physica A: Statistical Mechanics and its Applications, 1981, vol. 105, issue 3, 517-535

Abstract: The correlated effective field appoximation (CEFA) and the reaction field approximation (RFA) are discussed. It is shown that the usual justification for these approximations is not valid, but that they may be justified intuitively. The approximations are compared with exact results for the high-temperature expansions of the wavevector dependent susceptibility and for the critical temperatures for several lattices and spin values in the Ising and Heisenberg models. It is found that both the CEFA and the RFA are considerably better than the molecular field approximation, that the more complicated CEFA seems to be the better of the two in some cases where they do not coincide, and that both tend to overcompensate for the influence of correlations in several cases.

Date: 1981
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:105:y:1981:i:3:p:517-535

DOI: 10.1016/0378-4371(81)90108-4

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