Mechanism for nematic superconductivity in FeSe

Abstract

Despite its seemingly simple composition and structure, the pairing mechanism of FeSe remains an open problem due to several striking phenomena. Among them are nematic order without magnetic order, nodeless gap and unusual inelastic neutron spectra with a broad continuum, and gap anisotropy consistent with orbital selection of unknown origin. Here we propose a microscopic description of a nematic quantum spin liquid that reproduces key features of neutron spectra. We then study how the spin fluctuations of the local moments lead to pairing within a spin-fermion model. We find the resulting superconducting order parameter to be nodeless $s\pm d$-wave within each domain. Further we show that orbital dependent Hund's coupling can readily capture observed gap anisotropy. Our prediction calls for inelastic neutron scattering in a detwinned sample.

revised version, 6+8 pages, 4+7 figures

References in corpus (25)

• High-temperature superconductivity in iron-based materials
• Theory of Electron Nematic Order in LaOFeAs
• Weak magnetism and non-Fermi liquids near heavy-fermion critical points
• The Structural Phase Transition in FeSe (Fe1+dSe)
• Ising and Spin orders in Iron-based Superconductors
• Fractionalized Fermi liquids
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Orbital-driven nematicity in FeSe
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Discovery of Orbital-Selective Cooper Pairing in FeSe
• Emergence of the nematic electronic state in FeSe
• Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
• Anomalous Fermi surface in FeSe seen by Shubnikov-de Haas oscillation measurements
• Unified Picture for Magnetic Correlations in Iron-Based Superconductors
• Spin nematic correlations in bilinear-biquadratic S=1 spin chains
• Low-energy microscopic models for iron-based superconductors: a review
• Thermal Conductivity of the Iron-Based Superconductor FeSe : Nodeless Gap with Strong Two-Band Character
• Flux expulsion and greedy bosons: frustrated magnets at large N
• Phase diagram and continuous pair-unbinding transition of the bilinear-biquadratic S=1 Heisenberg chain in a magnetic field
• Interplay between magnetism, superconductivity, and orbital order in a 5-pocket model for iron-based superconductors - a parquet renormalization group study
• Competing instabilities, orbital ordering and splitting of band degeneracies from a parquet renormalization group analysis of a 4-pocket model for iron-based superconductors: application to FeSe
• Spin Ferroquadrupolar Order in the Nematic Phase of FeSe
• Possible Nematic Spin Liquid in Spin-$1$ Antiferromagnetic System on the Square Lattice: Implication for the Nematic Paramagnetic State of FeSe
• Electronic quasiparticles in the quantum dimer model: density matrix renormalization group results
• Diverging Nematic Susceptibility, Physical Meaning of T* scale, and Pseudogap in the Spin Fermion Model for Pnictides

Cited by in corpus (12)

• Nematicity, magnetism and superconductivity in FeSe
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Anisotropic spin fluctuations in detwinned FeSe
• Spin-excitation anisotropy in the nematic state of detwinned FeSe
• Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
• Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe
• Observation of the in-plane magnetic field-induced phase transitions in FeSe
• Singular magnetic anisotropy in the nematic phase of FeSe
• Visualization of local magnetic moments emerging from impurities in the Hund's metal states of FeSe
• Frustrated magnetic interactions in FeSe
• Phase diagram of the J1-J2 Heisenberg second-order topological quantum magnet
• Quasi-one-dimensional spin excitations in the iron pnictide NaFe${}_{0.53}$Cu${}_{0.47}$As