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Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x

We argue that the newly discovered superconductivity in a nearly magnetic, Fe-based layered compound is unconventional and mediated by antiferromagnetic spin fluctuations, though different from the usual superexchange and specific to this compound. This resulting state is an example of extended s-wave pairing with a sign reversal of the order parameter between different Fermi surface sheets. The main role of doping in this scenario is to lower the density of states and suppress the pair-breaking ferromagnetic fluctuations.

preprint2008arXivOpen access
I. I. MazinD. J. SinghM. D. JohannesM. H. Du
cond-mat.supr-concond-mat.mtrl-sci
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Open access4 authors2 topics
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Citations: 0Reviews: 0Saves: 0Code: not linkedDataset: not linkedInstitutions: 0

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I. I. MazinD. J. SinghM. D. JohannesM. H. Du

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