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Pertubative Approach to Spin‐1/2 Heisenberg Antiferromagnet
Author(s) -
Trimper S.
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.2221800124
Subject(s) - antiferromagnetism , diagonal , spin (aerodynamics) , magnetization , condensed matter physics , physics , algebraic number , commutation , function (biology) , mathematical physics , quantum mechanics , mathematics , mathematical analysis , thermodynamics , geometry , voltage , evolutionary biology , biology , magnetic field
The temperature Green's function matrix for a two‐sublatticc antiferromagnet is studied taking into account the complete algebraic properties of spin operators. The non‐diagonal part of Green's functions gives rise to a temperature dependent effective interaction. The staggered magnetization is calculated by summing up additional diagrams originated from the spin commutation relations.