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Two‐Atom Cluster Approximation for Ising Model ( S = 1/2)
Author(s) -
Balcerzak T.,
Bobák A.,
Jaščur M.,
Mielnicki J.,
Wiatrowski G.
Publication year - 1987
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.2221430129
Subject(s) - magnetization , curie temperature , ising model , spins , cluster (spacecraft) , correlation function (quantum field theory) , physics , condensed matter physics , square lattice ising model , atom (system on chip) , magnetic field , statistical physics , quantum mechanics , ferromagnetism , computer science , dielectric , embedded system , programming language
The cluster containing two spins and their neighbourhood is taken into account in the frame of a new effective field approximation. As the result, two coupled equations describing the magnetization and correlation function are derived. The numerical calculations of the Curie temperature, magnetization, correlation function, and magnetic specific heat for the case of s.q. and s.c. lattices are discussed.