Excitonic pairing in high-temperature superconductors

Jan Bała; Andrzej M. Oleś

doi:10.1103/PhysRevB.47.515

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Excitonic pairing in high-temperature superconductors

Jan Bała, Andrzej M. Oleś

DOI 10.1103/PhysRevB.47.515 · Physical Review B

T1

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Abstract

We study the pairing mechanism within MO2 (M=CuorBi) planes of high-temperature superconductors by calculating the binding energy and the character of doped holes within perturbation theory around the atomic limit. We extend the study of Nuñez Regueiro and Aligia [Phys. Rev. Lett. 61, 1889 (1988)], and show that the interoxygen Coulomb repulsion enhances the pairing in the magnetic regime and that small metal-oxygen repulsion suffices to stabilize pairing both in the bipolaronic and biexcitonic regimes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaPb1-xBixO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	13	Pressure not reported	unknown
Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
Ba1-xRbxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown