Impurity Effects on the Nodal Structure of Anisotropic Superconductors

Details Impurity Effects on the Nodal Structure of Anisotropic Superconductors Impurity Effects on the Nodal Structure of Anisotropic Superconductors

2011-06-21

arxiv.org/abs/1106.4187v1

Physics

Condensed Matter

Superconductivity

11 pages, 2 figures

Scientific paper

For anisotropic superconductors, the gap function belongs to an irreducible representation of the point group of crystals, which determines the nodal structure of the gap function. Impurity effects on anisotropic superconductors have been treated by the Born or T-matrix approximation by which only a partial sum of the pertutbation series is calculated. Instead, we take into acount all terms of the perturbation series. As a result, we find that the introduction of nonmagnetic impurities does not change the nodal structure in all cases. We also find how to obtain nodes of the gap function and show the list for $O_{h}$, $D_{4h}$, and $D_{6h}$.

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