Exotic ground states and impurities in multiband superconductors

Details Exotic ground states and impurities in multiband superconductors Exotic ground states and impurities in multiband superconductors

1999-07-22

arxiv.org/abs/cond-mat/9907331v1

Physics

Condensed Matter

Superconductivity

4 pages, no figures

Scientific paper

10.1209/epl/i1999-00503-6

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.

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