Size dependence of coherent anomalies in self-consistent cluster approximations
- 1 February 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 43 (4) , 3483-3492
- https://doi.org/10.1103/physrevb.43.3483
Abstract
The behavior of coherent anomalies in Weiss-type and Bethe-type cluster approximations is studied. In the Weiss-type case, logarithmic corrections to the naive coherent-anomaly-method (CAM) scaling relation, which have been ignored in previous works, play an important role in the CAM analysis. A phenomenological theory of the Bethe-type approximation is proposed to show that a logarithmic correction term also exists in this approximation. The correction has, however, smaller influence on the CAM analysis in this case.Keywords
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