Superconductivity in the two-dimensional Hubbard model: One-particle correlation functions

Chien-Hua Pao; N. E. Bickers

doi:10.1103/PhysRevB.51.16310

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Superconductivity in the two-dimensional Hubbard model: One-particle correlation functions

Chien-Hua Pao, N. E. Bickers

DOI 10.1103/PhysRevB.51.16310 · Physical Review B

T1

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Abstract

The one-particle correlation functions of a dx2-y2 superconducting state in the two-dimensional Hubbard model are investigated within the fluctuation-exchange approximation. This approximation has been previously applied to investigate properties of the Hubbard-model normal state, including incipient instabilities. Results are obtained for the wave vector and temperature dependence of the one-particle energy gap. A miximum gap ratio 2Δkmax(T=0)/kBTc of order 10 is obtained for intermediate coupling strengths and electron densities near one per site. The potential appearance of spin excitons in two-particle response functions is discussed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown