Superconductivity with angular dependent coupling: stripes, Coulomb repulsion and enhanced Tc
V. V. Moshchalkov, V. A. Ivanov
Abstract
We have analysed the effect of intrinsic doping inhomogeneity and the presence of stripes in high-Tc superconductors on coupling λby using a simple analytically solvable model with an angular dependent λ(ϕ) represented by a square-well form. We have found that the introduction of the Coulomb repulsion λC, increasing the ''contrast'' | λ| + | λC |, or the depth of the angular modulation of λ(ϕ), leads to a remarkable enhancement of Tc. This effect can be optimized by combining attractive (λ<0) and repulsive (λ>0) interactions along stripes and perpendicular to them.
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