The anomaly Cu doping effects on LiFeAs superconductors

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 ARP...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-10, Vol.26 (43), p.435703-435703
Main Authors: Xing, L Y, Miao, H, Wang, X C, Ma, J, Liu, Q Q, Deng, Z, Ding, H, Jin, C Q
Format: Article
Language:English
Subjects:
'1 1 1' type
anomaly doping effects
Carriers
Condensed matter
Conjugation
Copper
Doping
Fermi surfaces
iron based superconductor
Lattice parameters
Nickel
Superconductivity
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Summary: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. This indicates that there is little doping effect at Fermi surface by Cu substitution, in sharp contrast to the more effective carrier doping effect by Ni or Co.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/26/43/435703