Unconventional superconductivity with a sign reversal in the order parameter of LaFeAsO1-xFx |
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Authors: | Mazin I I Singh D J Johannes M D Du M H |
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Affiliation: | Code 6393, Naval Research Laboratory, Washington, D.C. 20375, USA. |
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Abstract: | 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. |
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