Open AccessThe total energy of Heisenberg ferromagnetic systems
Author(s) -
Huaiyu Wang,
Qiuying Xia
Publication year - 2007
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.56.5466
Subject(s) - ferromagnetism , physics , function (biology) , energy (signal processing) , total energy , spin (aerodynamics) , correlation function (quantum field theory) , heisenberg model , quantum mechanics , condensed matter physics , psychology , evolutionary biology , dielectric , displacement (psychology) , psychotherapist , biology , thermodynamics
The total energy of the Heisenberg ferromagnetic system is calculated by the many-body Green's function method under random phase approximation when the correlation function 〈S+S-〉 is considered. A general expression of the total energy universally applicable to any spin quantum number S is obtained. Numerical results are computed. The energy is lower than the case when the correlation function is not included.