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An Effective‐Field Theory of Mixed Ising Spin Systems in Transverse Fields
Author(s) -
Kaneyoshi T.,
Sarmento E. F.,
Fittipaldi I. P.
Publication year - 1988
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.2221500129
Subject(s) - ising model , formalism (music) , transverse plane , transverse field , magnetization , condensed matter physics , physics , effective field theory , spin (aerodynamics) , ising spin , statistical physics , quantum mechanics , magnetic field , thermodynamics , engineering , art , musical , structural engineering , visual arts
An effective‐field theory is proposed and used to derive the thermodynamic properties of the mixed Ising spin system consisting of spin‐½ and spin‐1 with different transverse fields. The effects of transverse fields on the critical behavior and the magnetization curves are studied. It is shown that the present formalism, in spite of its simplicity, yields results which represent a remarkable improvement on the mean‐field treatment.