Journal
PHYSICAL REVIEW B
Volume 79, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.144526
Keywords
antiferromagnetic materials; BCS theory; d-wave superconductivity; Hubbard model; Monte Carlo methods; organic superconductors; superconducting transitions; superconductivity; variational techniques
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We use a partially Gutzwiller projected BCS d-wave wave function with an antiferromagnetic-weighting factor to study the ground-state phase diagram of a half-filled Hubbard-Heisenberg model in a square lattice with nearest-neighbor hopping t and a diagonal hopping t('). The calculations are carried out by using variational Monte Carlo method which treats the Gutzwiller projection explicitly. At large on-site Coulomb interaction U, the ground state is antiferromagnetic. As U decreases, the ground state becomes superconducting and eventually metallic. The phase diagram is obtained by extensive calculations. As compared to the strong effect of U/t, the phase boundaries turn out to be less sensitive to t(')/t. The result is consistent with the phase diagram in layered organic conductors and is compared to the earlier mean-field result based on the Gutzwiller approximation.
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