The anomaly Cu doping effects on LiFeAs superconductors

Abstract

The Cu substitution effect on the superconductivity of LiFeAs has been studied in comparison with Co/Ni substitution. It is found that the shrinking rate of the lattice parameter c for Cu substitution is much smaller than that of Co/Ni substitution. This is in conjugation with the observation of ARPES that shows almost the same electron and hole Fermi surfaces (FSs) size for undoped and Cu substituted LiFeAs sample except for a very small hole band sinking below Fermi level with doping, indicating little doping effect at Fermi surface by Cu substitution, in sharp contrast to the much effective carrier doping effect by Ni or Co.

arXiv comment19 pages + 5 Figures Accepted by JPCM

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• Electron and Superconducting Properties of the AFeAs (A= Li, Na) Family Alkali-Metal Pnictides: Current Stage of the Research (mini-review)
• Hund's metal crossover and superconductivity in the 111 family of iron-based superconductors
• Observation of non-Fermi liquid behavior in hole-doped LiFe${}_{1-x}$V${}_x$As
• Localization and Orbital Selectivity in Iron-Based Superconductors with Cu Substitution
• Coexistence of Clean- and Dirty-limit Superconductivity in LiFeAs
• Copper doping effects on the superconducting properties of Sm-based oxypnictides
• Effect of impurity substitution on band structure and mass renormalization of the correlated FeTe${}_{0.5}$Se${}_{0.5}$ superconductor
• Absence of nematic instability in LiFeAs
• Fluctuating magnetism of Co- and Cu-doped NaFeAs
• Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs