Superconducting pairing of spin polarons in the t-J model

N. M. Plakida; V. S. Oudovenko; P. Horsch; A. I. Liechtenstein

doi:10.1103/PhysRevB.55.R11997

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Superconducting pairing of spin polarons in the t-J model

N. M. Plakida, V. S. Oudovenko, P. Horsch, A. I. Liechtenstein

DOI 10.1103/PhysRevB.55.R11997 · Physical Review B

T1

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Abstract

The pairing of quasiparticles in a CuO2 plane is studied within a spin-polaron formulation of the t-t|IH-J model. Our numerical solution of the Eliashberg equations unambiguously shows d-wave pairing between spin polarons on different sublattices mediated by the exchange of spin fluctuations, and a strong doping dependence of the quasiparticle bandwidth. The transition temperature Tc is an increasing function of J/t and crosses a maximum at an optimal doping concentration δopt. For the t-J model with J/t=0.4 we obtain Tc≃0.013t at δopt≃0.2.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	52	Pressure not reported	unknown