Superconducting pairing of spin polarons in the t-J model

Details Superconducting pairing of spin polarons in the t-J model Superconducting pairing of spin polarons in the t-J model

1995-10-20

arxiv.org/abs/cond-mat/9510120v1

Phys. Rev. B 55, R11997 (1997)

Physics

Condensed Matter

4 pages, 4 eps-figures for Latex2e

Scientific paper

10.1103/PhysRevB.55.R11997

The pairing of quasiparticles in a CuO$_2$ plane is studied within a spin polaron formulation of the $t$-$t^{'}$-$J$ 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 $T_c$ is an increasing function of $J/t$ and crosses a maximum at an optimal doping concentration $\delta_{opt}$. For the t-J model with $J/t=0.4$ we obtain $T_c\simeq 0.013 t$ at $\delta_{opt}\simeq 0.2$.

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