Bond-Operator Mean Field Theory for the Bilayer Heisenberg Model

Details Bond-Operator Mean Field Theory for the Bilayer Heisenberg Model Bond-Operator Mean Field Theory for the Bilayer Heisenberg Model

1998-08-05

arxiv.org/abs/cond-mat/9808048v3

J. Phys. Soc. Jpn., 68 (1999) 247

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, LaTeX, 8 figures, uses jpsj.sty, revised version: minor changes to the text, to appear in J. Phys. Soc. Jpn. Vol.68

Scientific paper

10.1143/JPSJ.68.247

Bond-operator mean field equations for the square-lattice, S=1/2 bilayer Heisenberg model are developed and solved numerically. In the vicinity of both the zero-field critical point and the field-induced transitions, comparisons are made with T=0 and finite-temperature strong coupling expansions. The mean-field theory suggests that the quantum critical region for the field-induced transitions is restricted to significantly lower temperatures than one might have concluded based on strong-coupling expansions or other numerical studies.

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