Mean Field Theory of the Square Lattice Antiferromagnetic Heisenberg Model
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概要
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A nearly half-filled two-dimensional Hubbard model has been considered as amodel for a high transition temperature oxide superconductor. A new scheme to treatthis model, the slave-fermion method, is proposed. The method is applied to themodel in the limit of large U at half-filled, where the model reduces to the antifer-romagnetic Heisenberg model. It is shown that the ground state energy becomesmuch lower in the slave-fermion scheme than that in the slave-boson scheme. Theground state shows antiferromagnetic long range order at T=0.
- 社団法人日本物理学会の論文
- 1989-01-15
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