TAO pairing: a fully gapped pairing scenario for the Iron-Based Superconductors

Abstract

Motivated by the fully gapped superconductivity in iron-based superconductors with uncompensated electron pockets, we propose a spin singlet, but orbital triplet analogue of the superfluid phase of He-3B. We show that orbital triplets with a nominal d-wave symmetry at the iron sites can transform as s-wave pairs under rotations about the selenium sites. Linear combinations of such d${}_{xy}$ and d${}_{x^2-y^2}$ triplets form a fully gapped, topological superconductor. Raman-active excitations are predicted to develop below the superconducting transition temperature.

Two column version, with significant revision

References in corpus (22)

• Classification of topological insulators and superconductors in three spatial dimensions
• High-temperature superconductivity in iron-based materials
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
• Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
• Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors
• Nodal Spin Density Wave and band topology of the FeAs based materials
• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
• d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors
• Anisotropic Energy Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs
• Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
• Observation of Leggett's collective mode in a multi-band MgB2 superconductor
• Strong-coupling Spin-singlet Superconductivity with Multiple Full Gaps in Hole-doped Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Probed by Fe-NMR
• Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
• Local measurement of the superfluid density in the pnictide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ across the superconducting dome
• $S_4$ Symmetric Microscopic Model for Iron-Based Superconductors
• Pairing symmetry and properties of iron-based high temperature superconductors
• Observation of an isotropic superconducting gap at the Brillouin zone center of Tl${}_{0.63}$K${}_{0.37}$Fe${}_{1.78}$Se${}_2$
• Limits on the Superconducting Order Parameter in NdFeAsO${}_{1-x}$F${}_y$ from Scanning SQUID Microscopy
• Symmetry of superconducting states with two orbitals on a tetragonal lattice: application to $La{O}_{1-x}{F}_{x}FeAs$
• Constraints Imposed by Symmetry on Pairing Operators for the Pnictides
• Classification of the Super-conducting order parameters under the point group symmetry for a multi-band system: application to LaOFeAs

Cited by in corpus (11)

• Charge Nematicity and Electronic Raman Scattering in Iron-based Superconductors
• Critical Quadrupole Fluctuations and Collective Modes in Iron Pnictide Superconductors
• Fully gapped $d$-wave superconductivity in CeCu${}_2$Si${}_2$
• Classification of multipole superconductivity in multi-orbital systems and its implications
• Band hybridization induced odd-frequency pairing in multiband superconductors
• Entangled Orbital Triplet Pairs in Iron-Based Superconductors
• Glide reflection symmetry, Brillouin zone folding and superconducting pairing for the $P4/nmm$ space group
• The Coulomb problem in iron based superconductors
• Time-reversal symmetry breaking superconductivity in hole-doped monolayer MoS${}_2$
• Spin-orbit-coupled superconductivity with spin-singlet non-unitary pairing
• ${}^3$He-R: A Topological $s^{\pm }$ Superfluid with Triplet Pairing