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Anisotropic superconductivity driven by kinematic interaction

V. A. Ivanov

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We have analysed the effect of kinematic pairing on the symmetry of superconducting order parameter for a square lattice in the frame of the strongly correlated Hubbard model. It is argued that in the first perturbation order the kinematic interaction renormalizes the Hubbard-I dispersions and provides at low doping the mixed singlet (s + s*)-wave superconductivity, giving way at higher doping to the triplet p-wave superconductivity. The obtained phase diagram depends only on the hopping integral parameter. The influence of the Coulomb repulsion on the kinematic superconducting pairing has been estimated. The (s + s*)-wave gap and the thermodynamic critical magnetic field have been derived.


PACS

71.10.Fd Lattice fermion models (Hubbard model, etc.)

74.20.Mn Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.)

74.25.Dw Superconductivity phase diagrams

Subjects

Superconductivity

Condensed matter: electrical, magnetic and optical

Dates

Issue 3 (1 November 2000)

Received 2 May 2000, accepted for publication 12 September 2000, in final form 12 September 2000



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