Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs

Abstract

We use neutron scattering to determine spin excitations in single crystals of nonsuperconducting Li1-xFeAs throughout the Brillouin zone. Although angle resolved photoemission experiments and local density approximation calculations suggest poor Fermi surface nesting conditions for antiferromagnetic(AF) order, spin excitations in Li1-xFeAs occur at the AF wave vectors Q = (1, 0) at low energies, but move to wave vectors Q = (\pm 0.5, \pm0.5) near the zone boundary with a total magnetic bandwidth comparable to that of BaFe2As2. These results reveal that AF spin excitations still dominate the low-energy physics of these materials and suggest both itinerancy and strong electron-electron correlations are essential to understand the measured magnetic excitations.

arXiv comment8 pages, 8 figures

References in corpus (26)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• The superconductivity at 18 K in LiFeAs system
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs
• Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
• A Numerical Renormalization Group Study of the Superconducting and Spin Density Wave Instabilities in MFeAsO${}_{1-x}$F${}_x$ Compounds
• Spin Waves and Magnetic Exchange Interactions in CaFe2As2
• Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
• Structure and superconductivity of LiFeAs
• Superconductivity without magnetism in LiFeAs
• Magnetism in Fe-based superconductors
• Low energy spin waves and magnetic interactions in SrFe${}_2$As${}_2$
• Anisotropic itinerant magnetism and spin fluctuations in BaFe2As2: A neutron scattering study
• Neutron Studies of the Iron-based Family of High TC Magnetic Superconductors
• The Synthesis and Characterization of LiFeAs and NaFeAs
• Spin fluctuations in LiFeAs observed by neutron scattering
• Spin waves in the $(\pi ,0)$ magnetically ordered iron chalcogenide Fe${}_{1.05}$Te
• Anisotropic three-dimensional magnetism in CaFe2As2
• Renormalization group analysis of competing orders and the pairing symmetry in Fe-based superconductors
• Dispersive Spin Fluctuations in the near optimally-doped superconductor Ba(Fe1-xCox)2As2 ($x$=0.065)
• Theory for Magnetism and Triplet Superconductivity in LiFeAs
• Enhancement of Superfluid Stiffness, Suppression of Superconducting T_c and Field-induced Magnetism in the Pnictide Superconductor LiFeAs

Cited by in corpus (20)

• Spin dynamics and an orbital-antiphase pairing symmetry in iron-based superconductors
• Local antiferromagnetic exchange and collaborative Fermi surface as key ingredients of high temperature superconductors
• Spin fluctuations in LiFeAs observed by neutron scattering
• Incommensurate magnetic excitations in superconducting LiFeAs
• Superconductivity, Antiferromagnetism, and Neutron Scattering
• 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
• Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors
• Orbital selective spin excitations and their impact on superconductivity of LiFe1-xCoxAs
• Nematic orders in Iron-based superconductors
• Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor
• Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
• Spin fluctuations away from (pi,0) in the superconducting phase of molecular-intercalated FeSe
• Raman Scattering Study of the Lattice Dynamics of Superconducting LiFeAs
• Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives
• Modelling the electronic structure and magnetic properties of LiFeAs and FeSe using hybrid-exchange density functional theory
• Absence of strong magnetic fluctuations in the iron phosphide superconductors LaFePO and Sr2ScO3FeP
• Electron-boson spectral density of LiFeAs obtained from optical data
• High-pressure self-flux growth and characterization of Li-deficient Li0.95FeAs single crystals
• Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs