Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs

Abstract

Using the angle-resolved photoemission spectroscopy (ARPES) data accumulated over the whole Brillouin zone (BZ) in LiFeAs we analyze the itinerant component of the dynamic spin susceptibility in this system in the normal and superconducting state. We identify the origin of the incommensurate magnetic inelastic neutron scattering (INS) intensity as scattering between the electron pockets, centered around the $(\pi ,\pi )$ point of the BZ and the large two-dimensional hole pocket, centered around the $\Gamma$-point of the BZ. As the magnitude of the superconducting gap within the large hole pocket is relatively small and angle dependent, we interpret the INS data in the superconducting state as a renormalization of the particle-hole continuum rather than a true spin exciton. Our comparison indicates that the INS data can be reasonably well described by both the sign changing symmetry of the superconducting gap between electron and hole pockets as well as sign preserving gap, depending on the assumptions made for the fermionic damping.

arXiv comment7 pages, 5 figures

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• Superconductivity from repulsion in LiFeAs: novel s-wave symmetry and potential time-reversal symmetry breaking
• Identifying the `Fingerprint' of Antiferromagnetic Spin-Fluctuations on Iron-Pnictide Superconductivity
• Imaging the Real Space Structure of the Spin Fluctuations in an Iron-based superconductor
• Strongly enhanced temperature dependence of the chemical potential in FeSe
• Revisit of the Orbital-Fluctuation-Mediated Superconductivity in LiFeAs: Nontrivial Spin-Orbit Interaction Effects on the Bandstructure and Superconducting Gap Function
• Incommensurate antiferromagnetic fluctuations in single-crystalline LiFeAs studied by inelastic neutron scattering
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• Unusual temperature evolution of superconductivity in LiFeAs
• Anomalous superconducting state in LiFeAs implied by the ${}^{75}$As Knight shift measurement
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• Suppression of spin-exciton state in hole overdoped iron-based superconductors
• Hund's metal crossover and superconductivity in the 111 family of iron-based superconductors
• Interband Quasiparticle Scattering in Superconducting LiFeAs Reconciles Photoemission and Tunneling Measurements
• Small and nearly isotropic hole-like Fermi surfaces in LiFeAs detected through de Haas van Alphen-effect
• Localization and Orbital Selectivity in Iron-Based Superconductors with Cu Substitution
• Spectroscopic evidence of nematic fluctuations in LiFeAs
• Theoretical approach to resonant inelastic x-ray scattering in iron-based superconductors at the energy scale of the superconducting gap
• Contribution of the Electron-Phonon Coupling to the Pairing Interaction in LiFeAs
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• Hole-$s_{\pm }$ State Induced by Coexisting Ferro- and Aniferromagnetic and Aniferro-orbital Fluctuations in the Iron Pnictides