Superconducting gap ratio and isotope-shift exponent in a pair-tunneling model

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 pai...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1998, Vol.294 (1), p.97-104
Main Authors: Das, A.N., Lahiri, Joydev, Sil, S.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure
Exact sciences and technology
Interlayer pairing
Isotope effect
Phase diagram
Phenomenological theories (two-fluid, ginzburg-landau, etc.)
Physics
Properties of type I and type II superconductors
Superconductivity
Theory and models of superconducting state
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Summary: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.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(97)01754-1