Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO1−xFx

I. I. Mazin; D. J. Singh; M. D. Johannes; M. H. Du

doi:10.1103/PhysRevLett.101.057003

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Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO1−xFx

I. I. Mazin, D. J. Singh, M. D. Johannes, M. H. Du

DOI 10.1103/PhysRevLett.101.057003 · Physical Review Letters

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	onset
LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	onset
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown