Abstract
The superconducting transition temperature ( T c), superconducting gap ratio and isotope-shift exponent ( α) are studied in a narrow band system with a two-dimensional band structure assuming an intra-plane pairing kernel, due to electron–phonon interactions and an interlayer tunneling of Cooper pairs for both isotropic s-wave and d-wave pairing. The pair-tunneling process enhances T c and the gap ratio while lowers α for both cases. The effect of an extended van Hove singularity in the electronic density of states on the gap ratio and α is investigated. The results are compared with the experimental findings of high- T c cuprates.
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