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TT: Fachverband Tiefe Temperaturen
TT 45: Superconductivity: (General) Theory
TT 45.2: Talk
Wednesday, March 13, 2013, 15:15–15:30, H21
Two-particle self-consistent approach to unconventional superconductivity — •Junya Otsuki — Department of Physics, Tohoku University, Sendai, Japan — Theoretische Physik III, Zentrum für Elektronische Korrelationen und Magnetismus, Universität Augsburg
A non-perturbative approach to unconventional superconductivity is developed based on the idea of the two-particle self-consistent (TPSC) theory[1].
An exact sum-rule which the momentum-dependent pairing susceptibility satisfies is derived.
Effective pairing interactions between quasiparticles are determined
so that an approximate susceptibility should fulfill this sum-rule, in which fluctuations belonging to different symmetries mix at finite momentum.
The mixing leads to a suppression of the dx2−y2 pairing close to the half-filling, resulting in a maximum of Tc away from half-filling.
[1] J. Otsuki, Phys. Rev. B 85, 104513 (2012).