Magnetic ground state of FeSe

Abstract

Elucidating the nature of the magnetism of a high-temperature superconductor is crucial for establishing its pairing mechanism. The parent compounds of the cuprate and iron-pnictide superconductors exhibit Néel and stripe magnetic order, respectively. However, FeSe, the structurally simplest iron-based superconductor, shows nematic order (Ts = 90 K), but not magnetic order in the parent phase, and its magnetic ground state is intensely debated. Here, we report inelastic neutron-scattering experiments that reveal both stripe and Néel spin fluctuations over a wide energy range at 110 K. On entering the nematic phase, a substantial amount of spectral weight is transferred from the Néel to the stripe spin fluctuations. Moreover, the total fluctuating magnetic moment of FeSe is ~ 60% larger than that in the iron pnictide BaFe2As2. Our results suggest that FeSe is a novel S = 1 nematic quantum-disordered paramagnet interpolating between the Néel and stripe magnetic instabilities.

Supplementary information included; accepted by Nature Communications

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Cited by in corpus (127)

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• Exotic Superconducting States in FeSe-based Materials
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Evidence for unidirectional nematic bond ordering in FeSe
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• Anisotropic spin fluctuations in detwinned FeSe
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• Strongly enhanced temperature dependence of the chemical potential in FeSe
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• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
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• Close proximity of FeSe to a magnetic quantum critical point as revealed by high-resolution $\mu$SR measurements
• Evolution of the nematic susceptibility in LaFe${}_{1-x}$Co${}_x$AsO
• Electronic nematicity in FeSe: a first-principles perspective
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• Superconductivity Mediated by Nematic Fluctuations in Tetragonal $\text{Fe}{\text{Se}}_{1-x}{\text{S}}_x$
• Theoretical study of impurity-induced magnetism in FeSe
• Decoupled Pairing Amplitude and Electronic Coherence in Iron-Based Superconductors
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• Mechanism for nematic superconductivity in FeSe
• Distinct pressure evolution of coupled nematic and magnetic order in FeSe
• Singular magnetic anisotropy in the nematic phase of FeSe
• Nematic correlation length in iron-based superconductors probed by inelastic x-ray scattering
• Photoinduced ultrafast dynamics of local nematicity and lattice distortions in FeSe crystals
• Antiferroquadrupolar order and rotational symmetry breaking in a generalized bilinear-biquadratic model on a square lattice
• Magnetism and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Paramagnon dispersion in $\beta$-FeSe observed by Fe $L$-edge resonant inelastic x-ray scattering
• Visualization of local magnetic moments emerging from impurities in the Hund's metal states of FeSe
• Coexistence of non-Abelian chiral spin liquid and magnetic order in a spin-1 antiferromagnet
• Spin excitations and the Fermi surface of superconducting FeS
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• Strain-Tuned Magnetic Frustration in a Square Lattice $J_1$-$J_2$ Material
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• Surface superconductor-insulator transition: Reduction of the critical electric field by Hartree-Fock potential
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• Lattice dynamics in FeSe via inelastic x-ray scattering and first-principles calculations
• Magnetic-Field-Induced Spin Nematicity in FeSe1-xSx and FeSe1-yTey Superconductor Systems
• Spin-isotropic continuum of spin excitations in antiferromagnetically ordered Fe${}_{1.07}$Te
• Ubiquitous stripe phase and enhanced electron pairing in interfacial high-Tc superconductor FeSe/BaTiO${}_3$
• Unexpected Enhancement of Three-Dimensional Low-Energy Spin Correlations in Quasi-Two-Dimensional Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ System at High Temperature
• Ab-initio investigation of lattice distortions in response to van der Waals interactions in FeSe
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• Doping effects on electronic states in electron-doped FeSe: Impact of self-energy and vertex corrections
• Long range magnetic order in hydroxide layer doped (Li${}_{1-x-y}$Fe${}_x$Mn${}_y$OD)FeSe
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• Stealth Majorana Zero Mode in a Trilayer Heterostructure MnTe/Bi2Te3/Fe(Te,Se)
• First-principles perspective on magnetic second sound
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• Identifying materials with charge-spin physics using charge-spin susceptibility computed from first principles
• Editorial on Research Topic: High-Tc Superconductivity in Electron-Doped Iron Selenide and Related Compounds
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• Unified Spin Model for Magnetic Excitations in Iron Chalcogenides
• Anomalous quantum oscillations from boson-mediated interband scattering
• Magnetic excitations in the normal and nematic phases of iron pnictides
• Spin Fluctuations in Sr${}_{1.8}$La${}_{0.2}$RuO${}_4$
• Spin fluctuations in the 112-type iron-based superconductor Ca${}_{0.82}$La${}_{0.18}$Fe${}_{0.96}$Ni${}_{0.04}$As${}_2$
• Electronic phase diagram of iron chalcogenide superconductors FeSe1-xSx and FeSe1-yTey
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• Decoupled nematic and magnetic criticality in FeSe${}_{1-x}$S${}_x$
• Stripe Antiferromagnetic Ground-State Configuration of FeSe Revealed by Density Functional Theory
• Short-lived electron excitations in $\mathrm{FeT}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{S}{\mathrm{e}}_{\mathrm{x}}$ as revealed by microwave absorption
• Enhancement of Superconductivity Linked with Linear-in-Temperature/Field Resistivity in Ion-Gated FeSe Films
• Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs
• Pomeranchuk instability in the nematic phase of two monolayer FeSe/SrTiO3
• Quasiparticle interaction originating from Bogoliubov Fermi Surfaces under pressure in 18%-S substituted FeSe studied via NMR