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Chin. Phys. B, 2021, Vol. 30(1): 017402    DOI: 10.1088/1674-1056/abd2ab

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 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
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.
Keywords:  iron-based superconductivity      transition metals doping      critical current density  
Received:  26 November 2020      Revised:  07 December 2020      Accepted manuscript online:  11 December 2020
PACS:  74.70.Xa (Pnictides and chalcogenides)  
  74.62.Dh (Effects of crystal defects, doping and substitution)  
  74.25.F- (Transport properties)  
  74.62.-c (Transition temperature variations, phase diagrams)  
Fund: 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).
Corresponding Authors:  Corresponding author. E-mail:   

Cite this article: 

Dong Li(李栋), Peipei Shen(沈沛沛), Sheng Ma(马晟), Zhongxu Wei(魏忠旭), Jie Yuan(袁洁), Kui Jin(金魁), Li Yu(俞理), Fang Zhou(周放), Xiaoli Dong(董晓莉), and Zhongxian Zhao(赵忠贤) Doping effects of transition metals on the superconductivity of (Li,Fe)OHFeSe films 2021 Chin. Phys. B 30 017402

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