Open AccessA GENERALIZED MIXED SPIN MODEL: A RENORMALISATION GROUP APPROACH
Author(s) -
Tang Kun-Fa,
Hu Jia-Zhen
Publication year - 1986
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.35.1048
Subject(s) - ising model , phase diagram , square lattice ising model , universality (dynamical systems) , physics , renormalization group , spin (aerodynamics) , critical exponent , group (periodic table) , mathematical physics , statistical physics , spin model , critical phenomena , condensed matter physics , phase transition , phase (matter) , quantum mechanics , thermodynamics
We propose a generalized Ising spin model, which contains the pure Ising model, the mixed spin model proposed by Schofield and Bowers and the particular site-diluted Ising spin model as special oases. A real space renormalisation group is applied to this model, the phase diagram is found to have three nontrivial fixed points (a Ising, a tric-ritical and a first order phase transition point). And it is demonstrated that mixed spin model and pure Ising spin model belong to the same universality, which is in agreement with the conclusion made by Schofield and Bowers who calculated the critical exponents of mixed model directly.