Spin fluctuations in LiFeAs observed by neutron scattering

Abstract

We report neutron inelastic scattering measurements on the stoichiometric iron-based superconductor LiFeAs. We find evidence for (i) magnetic scattering consistent with strong antiferromagnetic fluctuations, and (ii) an increase in intensity in the superconducting state at low energies, similar to the resonant magnetic excitation observed in other iron-based superconductors. The results do not support a recent theoretical prediction of spin-triplet p-wave superconductivity in LiFeAs, and instead suggest that the mechanism of superconductivity is similar to that in the other iron-based superconductors.

4 pages, 4 figures

References in corpus (23)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• The superconductivity at 18 K in LiFeAs system
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2
• Pairing Symmetry and Pairing State in Ferropnictides: Theoretical Overview
• Structure and superconductivity of LiFeAs
• Theory of magnetic excitations in iron-based layered superconductors
• Superconductivity without magnetism in LiFeAs
• Magnetism in Fe-based superconductors
• Neutron scattering as a probe of the Fe-pnicitide superconducting gap
• The Synthesis and Characterization of LiFeAs and NaFeAs
• Electronic Structure of Fe-Based Superconductors
• High energy spin excitations in BaFe2As2
• Anisotropic upper critical field and a possible Fulde-Ferrel-Larkin-Ovchinnikov state in a stoichiometric pnictide superconductor LiFeAs
• ${}^{75}$As NQR and NMR studies of superconductivity and electron correlations in iron arsenide Li${}_x$FeAs
• Theory for Magnetism and Triplet Superconductivity in LiFeAs
• Antiferromagnetic fluctuations in the normal state of LiFeAs
• Degradation of superconductivity and spin fluctuations by electron over-doping in LaFeAsO${}_{1-x}$F${}_x$
• Enhancement of Superfluid Stiffness, Suppression of Superconducting T_c and Field-induced Magnetism in the Pnictide Superconductor LiFeAs
• NMR evidence of strong-correlated superconductivity in LiFeAs: tuning toward an SDW ordering
• Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs
• Striped antiferromagnetic order and electronic properties of stoichiometric LiFeAs from first-principles calculations

Cited by in corpus (61)

• Superconductivity in Iron Compounds
• Gap symmetry and structure of Fe-based superconductors
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Functional Renormalization Group for multi-orbital Fermi Surface Instabilities
• Anisotropic Energy Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs
• Using Gap Symmetry and Structure to Reveal the Pairing Mechanism in Fe-based Superconductors
• Symmetry Enforced Chiral Hinge States and Surface Quantum Anomalous Hall Effect in Magnetic Axion Insulator ${\text{Bi}}_{2-x}{\text{Sm}}_x{\text{Se}}_3$
• One-sign order parameter in iron based superconductor
• Crossover from weak to strong pairing in unconventional superconductors
• Magnetic Resonant Mode in the Low-Energy Spin-Excitation Spectrum of Superconducting Rb2Fe4Se5 Single Crystals
• Strong $(\pi ,0)$ spin fluctuations in $\beta$-FeSe observed by neutron spectroscopy
• Effects of correlation in LiFeAs
• Nodeless vs nodal order parameters in LiFeAs and LiFeP superconductors
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Scanning tunneling spectroscopy of superconducting LiFeAs single crystals: Evidence for two nodeless energy gaps and coupling to a bosonic mode
• Observation of strong electron pairing on bands without Fermi surfaces in LiFe1-xCoxAs
• Orbital selective Fermi surface shifts and mechanism of high T${}_c$ superconductivity in correlated AFeAs (A=Li,Na)
• Incommensurate magnetic excitations in superconducting LiFeAs
• Close relationship between superconductivity and the bosonic mode in Ba0.6K0.4Fe2As2 and Na(Fe0.975Co0.025)As
• Superconductivity from repulsion in LiFeAs: novel s-wave symmetry and potential time-reversal symmetry breaking
• Superconducting gap in LiFeAs from three-dimensional spin-fluctuation pairing calculations
• Sign inversion in the superconducting order parameter of LiFeAs inferred from Bogoliubov quasiparticle interference
• The gradual destruction of magnetism in the superconducting family NaFe(1-x)CoxAs
• Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe${}_4$As${}_4$
• Identifying the `Fingerprint' of Antiferromagnetic Spin-Fluctuations on Iron-Pnictide Superconductivity
• Imaging the Electron-Boson Coupling in Superconducting FeSe
• Contrasts in electron correlations and inelastic scattering between LiFeAs and LiFeP revealed by charge transport
• Transport Properties and Electronic Phase Diagram of Single-Crystalline Ca${}_{10}$(Pt${}_3$As${}_8$) ((Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$)${}_5$
• 75As NMR-NQR study in superconducting LiFeAs
• Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor
• The magnetic moment enigma in Fe-based high temperature superconductors
• Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs
• Imaging the Real Space Structure of the Spin Fluctuations in an Iron-based superconductor
• Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4
• Revisit of the Orbital-Fluctuation-Mediated Superconductivity in LiFeAs: Nontrivial Spin-Orbit Interaction Effects on the Bandstructure and Superconducting Gap Function
• Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
• Switching of intra-orbital spin excitations in electron-doped iron pnictide superconductors
• Incommensurate antiferromagnetic fluctuations in single-crystalline LiFeAs studied by inelastic neutron scattering
• Coupling of structure to magnetic and superconducting orders in quasi-one-dimensional ${\text{K}}_2{\text{Cr}}_3{\text{As}}_3$
• Quantum phase transition of correlated iron-based superconductivity in LiFe${}_{1-x}$Co${}_x$As
• Spin fluctuations away from (pi,0) in the superconducting phase of molecular-intercalated FeSe
• Raman Scattering Study of the Lattice Dynamics of Superconducting LiFeAs
• Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials
• Anomalous superconducting state in LiFeAs implied by the ${}^{75}$As Knight shift measurement
• Electron and Superconducting Properties of the AFeAs (A= Li, Na) Family Alkali-Metal Pnictides: Current Stage of the Research (mini-review)
• Pairing insights in iron-based superconductors from scanning tunneling microscopy
• Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives
• Protected Fe valence in quasi-two dimensional $\alpha$-FeSi${}_2$
• Gapless spin-excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor
• A phenomenological multiband Eliashberg model for LiFeAs
• Two-Fluid Description for Iron-Based Superconductors
• Theoretical approach to resonant inelastic x-ray scattering in iron-based superconductors at the energy scale of the superconducting gap
• Modelling the electronic structure and magnetic properties of LiFeAs and FeSe using hybrid-exchange density functional theory
• Normal and superconducting properties of LiFeAs explained in the framework of four-band Eliashberg Theory
• The effects of Coulomb interactions on the superconducting gaps in iron-based superconductors
• Contribution of the Electron-Phonon Coupling to the Pairing Interaction in LiFeAs
• Electron-boson spectral density of LiFeAs obtained from optical data
• Anisotropy of the superconducting fluctuations in multiband superconductors: the case of LiFeAs
• Absence of strong magnetic fluctuations in the iron phosphide superconductors LaFePO and Sr2ScO3FeP
• Hole-$s_{\pm }$ State Induced by Coexisting Ferro- and Aniferromagnetic and Aniferro-orbital Fluctuations in the Iron Pnictides
• Quasiparticle interference in LiFeAs: Signature of inelastic tunneling through spin fluctuations