Superconductivity in electron-doped cuprates: Gap shape change and symmetry crossover with doping

Details Superconductivity in electron-doped cuprates: Gap shape change and symmetry crossover with doping Superconductivity in electron-doped cuprates: Gap shape change and symmetry crossover with doping

2002-06-12

arxiv.org/abs/cond-mat/0206208v2

Phys. Rev. B 69, 054509 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

7 eps figures, revtex. Corrected and expanded version accepted for Phys. Rev. B

Scientific paper

10.1103/PhysRevB.69.054509

The Kohn-Luttinger mechanism for superconductivity is investigated in a model for the electron doped cuprates. The symmetry of the order parameter of the superconducting phase is determined as a function of the geometry of the Fermi surface together with the structure of the electron-hole susceptibility. It is found to remain d_{x^2-y^2} wave within a large doping range. The shape of the gap anisotropy evolves with doping, with the maximum gap moving away from (pi ,0), in good agreement with recent experiments. As the shift of the maximum increases, a crossover to d_{xy}-symmetry is found.

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