$d$-wave pairing from spin fluctuations in the K$x$Fe2–$y$Se2 superconductors

Maier, T. A.; Graser, S.; Hirschfeld, P. J.; Scalapino, D. J.

doi:10.1103/physrevb.83.100515

$$d$$-wave pairing from spin fluctuations in the K_$$x$$Fe_2–$$y$$Se₂ superconductors

Journal Article · Thu Mar 31 00:00:00 EDT 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/physrevb.83.100515· OSTI ID:2484128

Maier, T. A. ^[1]; Graser, S. ^[2]; Hirschfeld, P. J. ^[3]; Scalapino, D. J. ^[4]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
University of Augsburg (Germany)
University of Florida, Gainesville, FL (United States)
University of California, Santa Barbara, CA (United States)

Angle-resolved photoemission spectroscopy measurements on the recently discovered superconductors in the KFe₂Se₂ family with critical temperatures up to ~33 K suggest that no Fermi pockets of hole character centered on the Γ point of the Brillouin zone are present, in contrast to all other known ferropnictide and ferrochalcogenide superconductors. Using a fluctuation exchange approximation and a five-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~(π,π), but without any symmetry-imposed nodes for the given Fermi surface. Furthermore, we propose experimental tests of this result, including the form of the resonance spectrum probed by inelastic neutron scattering.

View Accepted Manuscript (DOE)

Research Organization:: University of Florida, Gainesville, FL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: FG02-05ER46236

OSTI ID:: 2484128

Alternate ID(s):: OSTI ID: 1100160

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 10 Vol. 83; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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