中国物理B ›› 2021, Vol. 30 ›› Issue (1): 17402-.doi: 10.1088/1674-1056/abd2ab

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  • 收稿日期:2020-11-26 修回日期:2020-12-07 接受日期:2020-12-11 出版日期:2020-12-17 发布日期:2020-12-30

Doping effects of transition metals on the superconductivity of (Li,Fe)OHFeSe films

Dong Li(李栋)1,2, Peipei Shen(沈沛沛)1,2, Sheng Ma(马晟)1,2, Zhongxu Wei(魏忠旭)1,2, Jie Yuan(袁洁)1,2,3, Kui Jin(金魁)1,2,3, Li Yu(俞理)1,2,3, Fang Zhou(周放)1,2,3, Xiaoli Dong(董晓莉)1,2,3,†, and Zhongxian Zhao(赵忠贤)1,2,3   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 3 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • Received:2020-11-26 Revised:2020-12-07 Accepted:2020-12-11 Online:2020-12-17 Published:2020-12-30
  • Contact: Corresponding author. E-mail: dong@iphy.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0303003 and 2016YFA0300300), the National Natural Science Foundation of China (Grant Nos. 11834016 and 11888101), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos. XDB33010200 and XDB25000000), and the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant Nos. QYZDY-SSW-SLH001 and QYZDY-SSW-SLH008).

Abstract: The doping effects of transition metals (TMs = Mn, Co, Ni, and Cu) on the superconducting critical parameters are investigated in the films of iron selenide (Li,Fe)OHFeSe. The samples are grown via a matrix-assisted hydrothermal epitaxy method. Among the TMs, the elements of Mn and Co adjacent to Fe are observed to be incorporated into the crystal lattice more easily. It is suggested that the doped TMs mainly occupy the iron sites of the intercalated (Li,Fe)OH layers rather than those of the superconducting FeSe layers. We find that the critical current density J c can be enhanced much more strongly by the Mn dopant than the other TMs, while the critical temperature T c is weakly affected by the TM doping.

Key words: iron-based superconductivity, transition metals doping, critical current density

中图分类号:  (Pnictides and chalcogenides)

  • 74.70.Xa
74.62.Dh (Effects of crystal defects, doping and substitution) 74.25.F- (Transport properties) 74.62.-c (Transition temperature variations, phase diagrams)