Order-Parameter Anisotropies in the Pnictides - An Optimization Principle for Multi-Band Superconductivity

Details Order-Parameter Anisotropies in the Pnictides - An Optimization Principle for Multi-Band Superconductivity Order-Parameter Anisotropies in the Pnictides - An Optimization Principle for Multi-Band Superconductivity

2010-12-08

arxiv.org/abs/1012.1763v1

Ann. Phys. (Berlin) 523, 638 (2011)

Physics

Condensed Matter

Superconductivity

Scientific paper

Using general arguments of an optimization taking place between the pair wave function and the repulsive part of the electron-electron interaction, we analyze the superconducting gap in materials with multiple Fermi-surface (FS) pockets, with exemplary application to two proto-type ferropnictide setups. On the basis of functional renormalization group (FRG) calculations for a wide parameter span of the bare interactions, we show that the symmetry of the gap and the nodal versus nodeless behavior is driven by this optimization requirement.

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