Exotic ground states and impurities in multiband superconductors

Abstract

We consider the effect of isotropic impurity scattering on the exotic superconducting states that arise from the usual BCS mechanism in substances of cubic and hexagonal symmetry where the Fermi surface contains inequivalent but degenerate pockets (e.g. around several points of high symmetry). As examples we look at CeCo${}_2$, CeRu${}_2$, and LaB${}_6$; all of which have such Fermi surface topologies and the former exhibits unconventional superconducting behavior. We find that while these non s-wave states are suppressed by non-magnetic impurities, the suppression is much weaker than would be expected for unconventional superconductors with isotropic non-magnetic impurity scattering.

4 pages, no figures

Cited by in corpus (7)

• Feshbach resonances and mesoscopic phase separation near a quantum critical point in multiband FeAs-based superconductors
• Influence of Carbon Concentration on the Superconductivity in MgCxNi3
• Peak effect in CeRu${}_2$:history dependence and supercooling
• Gapless Fermi Surfaces in Superconducting CeCoIn5?
• Magnetic field-induced gapless state in multiband superconductors
• Pairing state in multicomponent superconductors
• Phase Separation Models for Cuprate Stripe Arrays