Variational Monte Carlo studies of gossamer superconductivity
Siegfried Guertler, Qiang-Hua Wang, Fu-Chun Zhang
DOI 10.1103/PhysRevB.79.144526 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2X Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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