Ordered Phase in the Fermionized Heisenberg Antiferromagnet

Details Ordered Phase in the Fermionized Heisenberg Antiferromagnet Ordered Phase in the Fermionized Heisenberg Antiferromagnet

1999-03-25

arxiv.org/abs/cond-mat/9903379v1

Physics

Condensed Matter

14 pages, 2 figures

Scientific paper

Thermal properties of the ordered phase of the spin 1/2 isotropic Heisenberg Antiferromagnet on a d-dimensional hypercubical lattice are studied within the fermionic representation when the constraint of single occupancy condition is taken into account by the method suggested by Popov and Fedotov. Using saddle point approximation in path integral approach we discuss not only the leading order but also the fluctuations around the saddle point at one-loop level. The influence of taking into account the single occupancy condition is discussed at all steps.

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