Doping dependence of antiferromagnetic correlations in high-temperature superconductors
M. Inui, S. Doniach, M. Gabay
DOI 10.1103/PhysRevB.38.6631 · Physical Review B
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Abstract
We have studied the single-band Hubbard model on a two-dimensional square lattice slightly below half filling. Using the canonical transformation and a form of variational wave function that allows an expansion in terms of hole concentration δ with respect to half filling, we find that a nonzero δ results in a frustration of the antiferromagnetic (AF) order favored by the superexchange interaction. Use of a variational Monte Carlo calculation enables us to construct a phase diagram in the tU−δ plane in which the AF order disappears at δ≈0.06 for a typical value of tU=14.
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