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.

5 figures,5 pages

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Cited by in corpus (9)

• Observation of strong electron pairing on bands without Fermi surfaces in LiFe1-xCoxAs
• Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
• Incommensurate antiferromagnetic fluctuations in single-crystalline LiFeAs studied by inelastic neutron scattering
• The anomaly Cu doping effects on LiFeAs superconductors
• Electron and Superconducting Properties of the AFeAs (A= Li, Na) Family Alkali-Metal Pnictides: Current Stage of the Research (mini-review)
• 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