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An Improved Correlated Effective‐Field Theory for the S = ½ Pure Ising Model
Author(s) -
Zheng S. M.
Publication year - 1993
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221800218
Subject(s) - ising model , decoupling (probability) , effective field theory , square lattice ising model , curie temperature , field (mathematics) , mathematics , statistical physics , field theory (psychology) , physics , condensed matter physics , mathematical physics , quantum mechanics , ferromagnetism , pure mathematics , engineering , control engineering
Abstract An improved correlated effective‐field theory is introduced for the S = ½ pure Ising model. The theory is based on an approximate decoupling formula for a spin operator which is more reasonable than that in the correlated effective‐field theory (CEFT) and is applied to some lattices for calculating the Curie temperatures. The results are superior to CEFT.