Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor

Abstract

We use transport, inelastic neutron scattering, and angle resolved photoemission experiments to demonstrate that the stoichiometric LiFeAs is an intrinsically electron-overdoped superconductor similar to those of the electron-overdoped NaFe1-xTxAs and BaFe2-xTxAs2 (T = Co,Ni). Furthermore, we show that although transport properties of the stoichiometric superconducting LiFeAs and Li-deficient nonsuperconducting Li1-xFeAs are different, their electronic and magnetic properties are rather similar. Therefore, the nonsuperconducting Li1-xFeAs is also in the electron overdoped regime, where small Li deficiencies near the FeAs octahedra can dramatically suppress superconductivity through the impurity scattering effect.

arXiv comment5 figures,5 pages

References in corpus (37)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• A Common Thread: the pairing interaction for the unconventional superconductors
• Gap symmetry and structure of Fe-based superconductors
• The superconductivity at 18 K in LiFeAs system
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Magnetism and its microscopic origin in iron-based high-temperature superconductors
• 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
• Structure and superconductivity of LiFeAs
• Superconductivity without magnetism in LiFeAs
• Magnetism in Fe-based superconductors
• Spin fluctuations and superconductivity in a 3D tight-binding model for BaFe2As2
• Unconventional Anisotropic s-Wave Superconducting Gaps of LiFeAs Iron-Pnictide Superconductor
• Superfluid density of the $\pm$s-wave state for the iron-based superconductors
• Resonant impurity scattering in the $\pm$s-gap state of the Fe-based superconductors
• Neutron Studies of the Iron-based Family of High TC Magnetic Superconductors
• The Synthesis and Characterization of LiFeAs and NaFeAs
• Superconductivity coexisting with phase-separated static magnetic order in (Ba,K)Fe${}_2$As${}_2$, (Sr,Na)Fe${}_2$As${}_2$ and CaFe${}_2$As${}_2$
• Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
• Control via electron count of the competition between magnetism and superconductivity in cobalt and nickel doped NaFeAs
• Incommensurate spin-density wave order in electron-doped BaFe2As2 superconductors
• Spin fluctuations in LiFeAs observed by neutron scattering
• Coexistence and competition of the short-range incommensurate antiferromagnetic order with superconductivity in BaFe2-xNixAs2
• Dispersive Spin Fluctuations in the near optimally-doped superconductor Ba(Fe1-xCox)2As2 ($x$=0.065)
• Enhancement of $T_c$ by disorder in underdoped iron pnictides
• Effect of Fermi Surface Nesting on Resonant Spin Excitations in Ba1-xKxFe2As2
• Incommensurate magnetic excitations in superconducting LiFeAs
• 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
• Electron doping evolution of the anisotropic spin excitations in BaFe2-xNixAs2
• Enhancement of Superfluid Stiffness, Suppression of Superconducting T_c and Field-induced Magnetism in the Pnictide Superconductor LiFeAs
• Evolution from unconventional spin density wave to superconductivity and a novel gap-like phase in NaFe1-xCoxAs
• Effect of a Zn impurity on T_c and its implication to pairing symmetry in LaFeAsO${}_{1-x}$F${}_x$
• Evolution of normal and superconducting properties of single crystals of Na${}_{1-\delta }$FeAs upon interaction with environment
• Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs

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• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Observation of strong electron pairing on bands without Fermi surfaces in LiFe1-xCoxAs
• Sign inversion in the superconducting order parameter of LiFeAs inferred from Bogoliubov quasiparticle interference
• Orbital selective spin excitations and their impact on superconductivity of LiFe1-xCoxAs
• 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
• Anisotropic resistivity of Na${}_{1-\delta }$Fe${}_{1-x}$Co${}_x$As
• Incommensurate antiferromagnetic fluctuations in single-crystalline LiFeAs studied by inelastic neutron scattering
• The anomaly Cu doping effects on LiFeAs superconductors
• Decoupled Pairing Amplitude and Electronic Coherence in Iron-Based Superconductors
• Electron and Superconducting Properties of the AFeAs (A= Li, Na) Family Alkali-Metal Pnictides: Current Stage of the Research (mini-review)
• Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives
• Small and nearly isotropic hole-like Fermi surfaces in LiFeAs detected through de Haas van Alphen-effect
• Review of nuclear magnetic resonance studies on iron-based superconductors
• Orbital selective neutron spin resonance in underdoped superconducting NaFe${}_{\text{0.985}}$Co${}_{\text{0.015}}$As
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• High-pressure self-flux growth and characterization of Li-deficient Li0.95FeAs single crystals
• Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs