Suppression of d-wave superconductivity in the checkerboard Hubbard model

D. G. S. P. Doluweera; A. Macridin; T. A. Maier; M. Jarrell; Th. Pruschke

doi:10.1103/PhysRevB.78.020504

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Suppression of d-wave superconductivity in the checkerboard Hubbard model

D. G. S. P. Doluweera, A. Macridin, T. A. Maier, M. Jarrell, Th. Pruschke

DOI 10.1103/PhysRevB.78.020504 · Physical Review B

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Abstract

Using a dynamical cluster quantum Monte Carlo approximation, we investigate the d-wave superconducting transition temperature Tc in the doped two-dimensional repulsive Hubbard model with a weak inhomogeneity. The inhomogeneity is introduced in the hoppings t′ and t in the form of a checkerboard pattern where t is the hopping within a 2×2 plaquette, and t′ is the hopping between the plaquettes. We find inhomogeneity suppresses Tc. The characteristic spin excitation energy and the strength of d-wave pairing interaction decrease with decreasing Tc, suggesting a strong correlation between these quantities.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ca2CuO2Cl2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown