Superconductivity without magnetism in LiFeAs

Abstract

The particular shape of the Fermi surface can give rise to a number of collective quantum phenomena in solids, such as density wave orderings or even superconductivity. In many new iron superconductors this shape, the 'nested' Fermi surface, is indeed observed, but its role in the formation of spin-density waves or superconductivity is not clear. We have studied the electronic structure of the non-magnetic LiFeAs (Tc~18K) superconductor using angle-resolved photoemission spectroscopy. We find a notable absence of the Fermi surface nesting, strong renormalization of the conduction bands by a factor of three, high density of states at the Fermi level caused by a Van Hove singularity, and no evidence for either a static or fluctuating order except superconductivity with in-plane isotropic energy gaps. Our observations set a new hierarchy of the electronic properties necessary for the superconductivity in iron pnictides and, possibly, in other materials.

Related work http://www.ifw-dresden.de/institutes/iff/research/SC/arpes

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Cited by in corpus (187)

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• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
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• Ironing out the details of unconventional superconductivity
• Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
• Multiple topological states in iron-based superconductors
• Iron based superconductors: magnetism, superconductivity and electronic structure
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• Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
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• Fe-based superconductors: an angle-resolved photoemission spectroscopy perspective
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• Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe0.55Se0.45
• Importance of Fermi surface topology for high temperature superconductivity in electron-doped iron arsenic superconductors
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Hund's metal physics: from SrNiO${}_2$ to NdNiO${}_2$
• One-sign order parameter in iron based superconductor
• Pauli-limiting effects in the upper critical fields of a clean LiFeAs single crystal
• Crossover from weak to strong pairing in unconventional superconductors
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• Spin fluctuations in LiFeAs observed by neutron scattering
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• Nodeless vs nodal order parameters in LiFeAs and LiFeP superconductors
• Many-body effects in iron pnictides and chalcogenides -- non-local vs dynamic origin of effective masses
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• Probing the Unconventional Superconducting State of LiFeAs by Quasiparticle Interference
• Theory for Magnetism and Triplet Superconductivity in LiFeAs
• A de Haas-van Alphen study of the Fermi surfaces of superconducting LiFeP and LiFeAs
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• Sign inversion in the superconducting order parameter of LiFeAs inferred from Bogoliubov quasiparticle interference
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• Interaction-induced singular Fermi surface in a high-temperature oxypnictide superconductor
• Orbital-differentiated coherence-incoherence crossover identified by photoemission spectroscopy in LiFeAs
• Spin-Fluctuation-Induced Non-Fermi-Liquid Behavior with suppressed superconductivity in LiFe${}_{1-x}$Co${}_x$As
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• NMR evidence of strong-correlated superconductivity in LiFeAs: tuning toward an SDW ordering
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• A weak-coupling superconductivity in the electron doped NaFe${}_{0.95}$Co${}_{0.05}$As is revealed by ARPES
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• Unusual temperature evolution of superconductivity in LiFeAs
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• Pressure effects on superconducting properties of single-crystalline Co doped NaFeAs
• Doping - dependent anisotropic superconducting gap in Na${}_{1-\delta }$(Fe${}_{1-x}$Co${}_x$)As
• Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials
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• Two-Particle Self-Consistent method for the multi-orbital Hubbard model
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• Two-Gap Superconductivity in CaFe_{0.88}Co_{0.12}AsF Revealed by Temperature Dependence of the Lower Critical Field H_{c1}^c(T)
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• Defect states in LiFeAs as seen by low temperature scanning tunneling microscopy and spectroscopy
• The effects of Coulomb interactions on the superconducting gaps in iron-based superconductors
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• Absence of hexagonal to square structural transition in LiFeAs vortex matter
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
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• Spin waves in the block checkerboard antiferromagnetic phase
• Direct observation of spin-orbit coupling in iron-based superconductors
• Majority carrier type inversion in FeSe family and "doped semimetal" scheme in iron-based superconductors
• Anisotropy of the superconducting fluctuations in multiband superconductors: the case of LiFeAs
• Isotropic multi-gap superconductivity in BaFe1.9Pt0.1As2 from thermal transport and spectroscopic measurements
• Signatures of unconventional pairing in near-vortex electronic structure of LiFeAs
• Evidence for bosonic mode coupling in electron dynamics of LiFeAs superconductor
• The Hund's Superconductor Li(Fe,Co)As
• Observation of a van Hove singularity and implication for strong coupling induced Cooper pairing in KFe2As2
• Change of Fermi surface states related with two different $T_{\mathrm{c}}$-raising mechanisms in iron pnictide superconductor
• Magnetic excitations in the normal and nematic phases of iron pnictides
• Electronic Structure of ${\mathrm{Sr}}_{1-y}{\mathrm{Ca}}_y\mathrm{F}{\mathrm{e}}_2({\mathrm{As}}_{1-x}{\mathrm{P}}_x{)}_2$ ($x$ = 0.25, $y$ = 0.08) Revealed by Angle-Resolved Photoemission Spectroscopy
• Effects of metallic spacer in layered superconducting Sr2(Mg${}_y$Ti${}_{1-y}$)O3FeAs
• Nodal superconducting gap in LiFeP revealed by NMR: contrast with LiFeAs
• Quasiparticle interference in LiFeAs: Signature of inelastic tunneling through spin fluctuations