Two-Particle Self-Consistent Approach to Anisotropic Superconductivity

Details Two-Particle Self-Consistent Approach to Anisotropic Superconductivity Two-Particle Self-Consistent Approach to Anisotropic Superconductivity

2011-12-20

arxiv.org/abs/1112.4701v1

Phys. Rev. B 85, 104513 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 5 figures

Scientific paper

10.1103/PhysRevB.85.104513

A nonperturbative approach to anisotropic superconductivity is developed based on the idea of two-particle self-consistent (TPSC) theory by Vilk and Tremblay. A sum-rule which the momentum-dependent pairing susceptibility satisfies is derived. An effective pairing interaction between quasiparticles is determined so that the susceptibility should fulfill this exact sum-rule, in which fluctuations belonging to different symmetries couple at finite momentum. It is demonstrated that the mode coupling between d-wave and s-wave pairing fluctuations leads to suppression of the d-wave fluctuation near the Mott insulator.

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