Abstract
We have investigated numerically the pairing instabilities of Gutzwiller wavefunctions. These are equivalent to a certain form of the resonant valence bond wavefunction. The case considered is a nearly half-filled two dimensional band with interactions given by a Hubbard model with large on-site Coulomb interactions. We find that the paramagnetic normal state is unstable tod-wave pairing but stable againsts-wave pairing. The antiferromagnetic state is marginally stable against both types of pairing. These results can be explained as an interference effect resulting in enhanced antiferromagnetic spin correlation in the paired state.
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Gros, C., Joynt, R. & Rice, T.M. Superconducting instability in the large-U limit of the two-dimensional Hubbard model. Z. Physik B - Condensed Matter 68, 425–432 (1987). https://doi.org/10.1007/BF01471072
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DOI: https://doi.org/10.1007/BF01471072