Evolution of the neutron resonances in AFe2Se2

Abstract

Recent experiments on the alkali-intercalated iron selenides have raised questions about the symmetry of the superconducting phase. Random phase approximation calculations of the leading pairing eigenstate for a tight- binding 5-orbital Hubbard-Hund model of AFe2Se2 find that a d-wave (B1g) state evolves into an extended s{\pm} (A1g) state as the system is hole-doped. However, over a range of doping these two states are nearly degenerate. Here, we calculate the imaginary part of the magnetic spin susceptibility χ"(q,ω) for these gaps and discuss how the evolution of neutron scattering resonances can distinguish between them.

References in corpus (10)

• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Magnetism in Fe-based superconductors
• d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors
• Pairing State with a time-reversal symmetry breaking in FeAs based superconductors
• Inter-pocket pairing and gap symmetry in Fe-based superconductors with only electron pockets
• Neutron Scattering Resonance and the Fe-pnictide Superconducting Gap
• Angle-resolved photoemission evidence of s-wave superconducting gap in KxFe2-ySe2 superconductor
• Emergence of Fully-Gapped $s_{++}$-wave and Nodal d-wave States Mediated by Orbital- and Spin-Fluctuations in Ten-Orbital Model for KFe${}_2$Se${}_2$
• Stripes, spin resonance and $d_{x^2-y^2}-$pairing symmetry in FeSe-based layered superconductors

Cited by in corpus (14)

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• Superconducting Properties of the $s^{\pm }$-wave state: Fe-based superconductors
• Suppression of superconductivity by Neel-type magnetic fluctuations in the iron pnictides
• Short-range cluster spin glass near optimal superconductivity in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Spin fluctuations and superconductivity in KxFe{2-y}Se2
• Magnonlike dispersion of spin resonance in Ni-doped BaFe${}_2$As${}_2$
• Spin fluctuations away from (pi,0) in the superconducting phase of molecular-intercalated FeSe
• Spin resonance in AFe2Se2 with s-wave pairing symmetry
• Hidden sign-changing $s$-wave superconductivity in monolayer FeSe
• Doping evolution of the normal state magnetic excitations in pressurized La3Ni2O7
• Stabilization of $s$-wave superconductivity through arsenic $p$-orbital hybridization in electron-doped BaFe${}_2$As${}_2$
• Low-energy spin excitations in optimally doped CaFe${}_{0.88}$Co${}_{0.12}$AsF superconductor studied with inelastic neutron scattering
• Magnetic excitations in the normal and nematic phases of iron pnictides
• Coupled Hubbard ladders at weak coupling: Pairing and spin excitations