S-wave superconductivity with orbital dependent sign change in the checkerboard models of iron-based superconductors

Abstract

We study three different multi-orbital models for iron-based superconductors (iron-SCs) in the solvable limit of weakly coupled square plaquettes. The strongest superconducting (SC) pairing is in the $A_{1g}$ $s$-wave channel and its development is correlated with the emergence of the next-nearest-neighbour antiferromagnetism (NNN-AFM). For the models with more than three orbitals, this study suggests that the signs of the intra-orbital pairing order parameters of the $d_{xy}$ and the $d_{xz}$ (or $d_{yz}$) orbitals must be {\it opposite}. Such sign difference stems from the intrinsic symmetry properties of inter-orbital hoppings and might, ultimately, lead to the sign-change of the SC orders between the hole Fermi pockets at the $\Gamma$ point and produce anisotropic or even gapless SC gaps in the electron Fermi pockets around the $M$ point in reciprocal space, as restoring back to the homogeneous limit.

5 figures, 5 pages

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Cited by in corpus (20)

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• Highly anisotropic and two-fold symmetric superconducting gap in nematically ordered FeSe${}_{0.93}$S${}_{0.07}$
• $S_4$ Symmetric Microscopic Model for Iron-Based Superconductors
• Quantum Monte Carlo Study of Pairing Symmetry and Correlation in Iron-based Superconductors
• Spectral properties of transition metal pnictides and chalcogenides: angle-resolved photoemission spectroscopy and dynamical mean field theory
• 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${}_2$
• Odd parity pairing and nodeless anti-phase $s^{\pm }$ in Iron-Based Superconductors
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• Ground state pairing correlations in the $S_4$ symmetric microscopic model for iron-based superconductors
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• Multi-Atom Quasiparticle Scattering Interference for Superconductor Energy-Gap Symmetry Determination
• Weak Spin Fluctuation with Finite Wave Vector and Superconducting Gap Symmetry in KxFe2-ySe2: 77Se Nuclear Magnetic Resonance
• Free energy and metastable states in the square-lattice $J_1$-$J_2$ Ising model
• A Short Review of the $S_4$ Symmetric Microscopic Model for Iron-Based High Temperature Superconductors
• Probing superconductivity and pairing symmetry by coherent phonons in multiorbital superconductors
• Iron-Based Superconductors as Parity Odd Superconductors