Anisotropic superconductivity driven by kinematic interaction
Laboratorium voor Vaste-Stoffysica en Magnetisme,
Katholieke Universiteit Leuven
Celestijnenlaan 200D, B-3001 Leuven, Belgium
Accepted: 12 September 2000
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 -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 -wave gap and the thermodynamic critical magnetic field have been derived.
PACS: 74.25.Dw – Superconductivity phase diagrams / 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.)
© EDP Sciences, 2000