Effect of Zn doping in under- and over-doped LaFe1−xCoxAsO system

We study the effect of nonmagnetic Zn impurity on superconductivity in the Co-doped LaFe1−x−yCoxZnyAsO system. A light Zn doping drastically suppresses the superconducting transition temperature for both under- and over-doped superconductors. This is consistent with the theoretical prediction within...

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Bibliographic Details
Published in:Europhysics letters 2013-05, Vol.102 (3)
Main Authors: Li, Yuke, Shen, Chenyi, Luo, Yongkang, Yang, Xiaojun, Tao, Qian, Cao, Guang-Han, Xu, Zhu-An
Format: Article
Language:English
Subjects:
74.20.Rp
74.25.F
74.70.Xa
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Summary:We study the effect of nonmagnetic Zn impurity on superconductivity in the Co-doped LaFe1−x−yCoxZnyAsO system. A light Zn doping drastically suppresses the superconducting transition temperature for both under- and over-doped superconductors. This is consistent with the theoretical prediction within the scenario of s -wave or d-wave pairings. The rate of the Tc decrease, , is substantially smaller in the under-doped regime than in the over-doped regime. We propose that the less drastic Tc reduction in the under-doped superconductor is due to the suppression of a competing antiferromagnetic order, which is in favor of superconductivity.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/102/37003