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d -wave pairing from spin fluctuations in the K x Fe 2…

2011; American Physical Society; Volume: 83; Issue: 10 Linguagem: Inglês

10.1103/physrevb.83.100515

1550-235X

Thomas Maier, S. Gräser, P. J. Hirschfeld, D. J. Scalapino,

Iron-based superconductors research

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.