Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Superconductivity: (General) Theory
TT 50.6: Vortrag
Freitag, 30. März 2012, 11:00–11:15, H 3010
(contribution withdrawn)Two-particle self-consistent approach to anisotropic superconductivity — •Junya Otsuki — Department of Physics, Tohoku University, Sendai, Japan — Theoretische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 anisotropic superconductivity is developed based on the idea of the two-particle self-consistent (TPSC) theory by Vilk and Tremblay [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.
Y. M. Vilk and A.-M. Tremblay, J. Phys. I (Paris) 7 (1997) 1309.