Superconducting pairing of spin polarons in the t-J model

Article

关键词: 2-DIMENSIONAL HUBBARD-MODEL;    HIGH-TEMPERATURE SUPERCONDUCTIVITY;    NORMAL-STATE PROPERTIES;    QUASI-PARTICLE;    FERMI-SURFACE;    QUANTUM ANTIFERROMAGNET;    CORRELATED ELECTRONS;    SPECTRAL-FUNCTION;    WAVE EXCHANGE;    BAG MECHANISM;   

DOI  :  10.1103/PhysRevB.55.R11997

来源: SCIE

【 摘 要 】

The pairing of quasiparticles in a CuO2 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 similar or equal to 0.013t at delta(opt)similar or equal to 0.2.

【 授权许可】

Free