d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors

Details d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors

2011-01-26

arxiv.org/abs/1101.4988v1

Phys. Rev. B 83, 100515(R) (2011)

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures, submitted to Rapid Communications

Scientific paper

10.1103/PhysRevB.83.100515

Angle-resolved photoemission spectroscopy measurements on the recently discovered superconduc- tors in the KFe2Se2 family with critical temperatures up to - 33K suggest that no Fermi pockets of hole character centered on the {\Gamma} point of the Brillouin zone are present, in contrast to all other known ferropnictide and ferrochalcogenide superconductors. Using a fluctuation exchange approximation and a 5-orbital tight-binding description of the band structure, we calculate the effective pairing interaction. We find that the pairing state in this system is most likely to have d-wave symmetry due to pair scattering between the remaining electron Fermi pockets at wave vector q - ({\pi}, {\pi}), but without any symmetry-imposed nodes for the given Fermi surface. We propose experimental tests of this result, including the form of the resonance spectrum probed by inelastic neutron scattering.

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