Influence of Spin Orbit Coupling in the Iron-Based Superconductors

Abstract

We report on the influence of spin-orbit coupling (SOC) in the Fe-based superconductors (FeSCs) via application of circularly-polarized spin and angle-resolved photoemission spectroscopy. We combine this technique in representative members of both the Fe-pnictides and Fe-chalcogenides with ab initio density functional theory and tight-binding calculations to establish an ubiquitous modification of the electronic structure in these materials imbued by SOC. The influence of SOC is found to be concentrated on the hole pockets where the superconducting gap is generally found to be largest. This result contests descriptions of superconductivity in these materials in terms of pure spin-singlet eigenstates, raising questions regarding the possible pairing mechanisms and role of SOC therein.

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Cited by in corpus (23)

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• Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors
• Computational Framework for Angle-Resolved Photoemission Spectroscopy
• Superconductivity-induced nematicity
• Evidence of hot and cold spots on the Fermi surface of LiFeAs
• Effect of Zeeman coupling on the Majorana vortex modes in iron-based topological superconductors
• Spin-Orbital-Intertwined Nematic State in FeSe
• Origin of Topological Surface Superconductivity in FeSe${}_{0.45}$Te${}_{0.55}$
• Electron and Superconducting Properties of the AFeAs (A= Li, Na) Family Alkali-Metal Pnictides: Current Stage of the Research (mini-review)
• FeSe and the missing electron pocket problem
• Pressure induced Lifshitz transition in ThFeAsN
• On the Spatial Locality of Electronic Correlations in LiFeAs
• Spin-Orbital Hallmarks of Unconventional Superconductors Without Inversion Symmetry
• The Three-Dimensional Electronic Structure of LiFeAs: Strong-coupling Superconductivity and Topology in the Iron Pnictides
• Observation of orbital ordering and origin of the nematic order in FeSe
• Quasiparticle Interference and Symmetry of Superconducting Order Parameter in Strongly Electron-Doped Iron-based Superconductors
• Orbital-selective correlations and renormalized electronic structure in LiFeAs
• Constraints on the two-dimensional pseudo-spin 1/2 Mott insulator description of Sr${}_2$IrO${}_4$
• Skyrmion-like textures in superconductors with competing order
• Feedback of non-local $d_{xy}$ nematicity on the magnetic anisotropy in FeSe
• Pomeranchuk instability in the nematic phase of two monolayer FeSe/SrTiO3