Superconductivity within the pair-tunneling model close to the metal-insulator transition

We have considered the problem of s-wave and d-wave superconductivity in the two-layer Hubbard model close to the metal-insulator transition. To mimic the formation of the insulating gap, the Coulomb correlations have been taken into account within the Hubbard I approximation. The interlayer momentu...

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Bibliographic Details
Published in:Journal of superconductivity 1998-12, Vol.11 (6), p.667-671
Main Authors: BIESIADA, J, ZIELINSKI, J
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Proximity effects, weak links, tunneling phenomena, and Josephson effects
Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions
Superconductivity
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Summary:We have considered the problem of s-wave and d-wave superconductivity in the two-layer Hubbard model close to the metal-insulator transition. To mimic the formation of the insulating gap, the Coulomb correlations have been taken into account within the Hubbard I approximation. The interlayer momentum-conserving Josephson tunneling between the layers has been included on the mean-field level. We demonstrate that the interlayer tunneling may contribute to the occurrence of mixed d+s wave symmetry of the superconducting state with a dominating d-wave component at a low concentration of holes. The problem of the validity of the pair-tunneling model is also briefly discussed.
ISSN:0896-1107
1572-9605
DOI:10.1023/A:1022668401746