Superconductivity in doped two-leg ladder cuprates
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Within the t-J ladder model, superconductivity with a modified d-wave symmetry in doped two-leg ladder cuprates is investigated based on the kinetic energy driven superconducting mechanism. It is shown that the spin-liquid ground-state at the half-filling evolves into the superconducting ground-state upon doping. In analogy to the doping dependence of the superconducting transition temperature in the planar cuprate superconductors, the superconducting transition temperature in doped two-leg ladder cuprates increases with increasing doping in the underdoped regime, and reaches a maximum in the optimal doping, then decreases in the overdoped regime.
8 pages, 2 figures, typos corrected, accepted for publication in Phys. Lett. A
8 pages, 2 figures, typos corrected, accepted for publication in Phys. Lett. A