Violation of Anderson's Theorem for Sign-Reversing s-Wave State of Iron-Pnictide Superconductors

Details Violation of Anderson's Theorem for Sign-Reversing s-Wave State of Iron-Pnictide Superconductors Violation of Anderson's Theorem for Sign-Reversing s-Wave State of Iron-Pnictide Superconductors

2009-06-12

arxiv.org/abs/0906.2269v4

Phys. Rev. Lett. 103, 177001 (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

Based on the five-orbital model, we study the effect of local impurity in iron pnictides, and find that the interband impurity scattering is promoted by the d-orbital degree of freedom. This fact means that the fully-gapped sign-reversing s-wave state, which is predicted by spin fluctuation theories, is very fragile against impurities. In the BCS theory, only 1% impurities with intermediate strength induce huge pair-breaking, resulting in the large in-gap state and prominent reduction in Tc, contrary to the prediction based on simple orbital-less models. The present study provides a stringent constraint on the pairing symmetry and the electronic states in iron pnictides.

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