Stripes, spin resonance and $d_{x^2-y^2}-$pairing symmetry in FeSe-based layered superconductors

Abstract

We calculate RPA-BCS based spin resonance spectra of newly discovered iron-selenide superconductor using two orbitals tight-binding (TB) model. The slightly squarish electron pocket Fermi surfaces (FSs) at $(\pi ,0)/(0,\pi )-$momenta produce leading interpocket nesting instability at incommensurate vector $q\sim (\pi ,0.5\pi )$ in the normal state static susceptibility, pinning a strong stripe-like spin-density wave (SDW) or antiferromagnetic (AFM) order at some critical value of $U$. The same nesting also induces $d_{x^2-y^2}-$pairing. The superconducting (SC) gap is nodeless and isotropic on the FSs as they are concentric to the four-fold symmetry point of the $d-$wave gap maxima, in agreement with various measurements. This induces an slightly incommensurate spin resonance with `hour-glass'-like dispersion feature, in close agreement with neutron data of chalcogenides. We also calculate $T$ pendence of the SC gap solving BCS gap equations and find that the spin resonance follows the same $T$ evolution of $\Delta (T)$ both in energy and intensity, suggesting that an itinerant weak or intermediate pair coupling theory is relevant in this system.

4.5 pages, 4 figures; Submitted (v2): Some types are corrected (v3): Expanded and published version

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• Orbital Selective Superconductivity in a Two-band Model of Infinite-Layer Nickelates
• Angle-resolved photoemission evidence of s-wave superconducting gap in KxFe2-ySe2 superconductor
• Superconductivity in Infinite-layer Nickelates : Role of Non-zero f-ness
• ARPES measurements of the superconducting gap of Fe-based superconductors and their implications to the pairing mechanism
• Observation of an isotropic superconducting gap at the Brillouin zone center of Tl${}_{0.63}$K${}_{0.37}$Fe${}_{1.78}$Se${}_2$
• Superconductivity and magnetism in RbxFe2-ySe2: Impact of thermal treatment on mesoscopic phase separation
• Collective modes in multiband superconductors: Raman scattering in iron selenides
• Vertical loop nodes in iron-based superconductors
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• Possible pairing symmetry in the FeSe-based superconductors determined by quasiparticle interference
• Prediction of $f$-wave pairing symmetry in YBa${}_2$Cu${}_3$O${}_{6+x}$ cuprates
• Crossover from inelastic magnetic scattering of Cooper pairs to spin-wave dispersion produces low-energy kink in cuprates
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• Self-consistent spin-fluctuation spectrum and correlated electronic structure of actinides
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• Spin-orbit density wave: A new phase of matter applicable to the hidden order state of URu2Si2
• In-gap bound states induced by a single nonmagnetic impurity in sign-preserving s-wave superconductors with incipient bands