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Chin. Phys. B, 2021, Vol. 30(2): 027401    DOI: 10.1088/1674-1056/abcf98
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Superconducting anisotropy and vortex pinning in CaKFe4As4 and KCa2Fe4As4F2

A B Yu(于奥博)1,4,5, Z Huang(黄喆)1,4, C Zhang(张驰)1,4,5, Y F Wu(吴宇峰)2, T Wang(王腾)1,4, T Xie(谢涛)5,6, C Liu(刘畅)5,6, H Li(李浩)1,4,5, W Peng(彭炜)1,4,5, H Q Luo(罗会仟)5,6,7, G Mu(牟刚)1,4,5, H Xiao(肖宏)3, L X You(尤立星)1,4,5, and T Hu(胡涛)2,
1 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China; 2 Beijing Academy of Quantum Information Sciences, Beijing 100193, China; 3 Center for High Pressure Science and Technology Advanced Research, Beijing 100094, China; 4 CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai 200050, China; 5 University of Chinese Academy of Sciences, Beijing 100049, China; 6 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 7 Songshan Lake Materials Laboratory, Dongguan 523808, China
Abstract  The vortex pinning determining the current carrying capacity of a superconductor is an important property to the applications of superconducting materials. For layered superconductors, the vortex pinning can be enhanced by a strong interlayer interaction in accompany with a suppression of superconducting anisotropy, which remains to be investigated in iron based superconductors (FeSCs) with the layered structure. Here, based on the transport and magnetic torque measurements, we experimentally investigate the vortex pinning in two bilayer FeSCs, CaKFe4As4(Fe1144) and KCa2Fe4As4F2(Fe12442), and compare their superconducting anisotropy γ. While the anisotropy γ ≈ 3 for Fe1144 is much smaller than γ ≈ 15 in Fe12442 around T c, a higher flux pinning energy as evidenced by a higher critical current density is found in Fe1144, as compared with the case of Fe12442. In combination with the literature data of Ba0.72K0.28Fe2As2 and NdFeAsO0.82F0.18, we reveal an anti-correlation between the pinning energy and the superconducting anisotropy in these FeSCs. Our results thus suggest that the interlayer interaction can not be neglected when considering the vortex pinning in FeSCs.
Keywords:  iron based superconductors      vortex pinning      anisotropy  
Published:  18 January 2021
PACS:  74.25.Qt  
  75.30.Gw (Magnetic anisotropy)  
  74.25.Sv (Critical currents)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11574338) and the National Natural Science Foundation of China-China Academy of Engineering Physics NSAF Joint Fund (Grant No. U1530402). The experimental measurements were supported by the Superconducting Electronics Facility (SELF) of Shanghai Institute of Microsystem and Information Technology. The work at IOP, CAS was supported by the National Key Research and Development Program of China (Grant No. 2018YFA0704200), the National Natural Science Foundation of China (Grant Nos. 11822411 and 11961160699), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) (Grant No. XDB25000000), and the Youth Innovation Promotion Association of CAS (Grant No. 2016004).
Corresponding Authors:  Corresponding author. E-mail: hutao@baqis.ac.cn   

Cite this article: 

A B Yu(于奥博), Z Huang(黄喆), C Zhang(张驰), Y F Wu(吴宇峰), T Wang(王腾), T Xie(谢涛), C Liu(刘畅), H Li(李浩), W Peng(彭炜), H Q Luo(罗会仟), G Mu(牟刚), H Xiao(肖宏), L X You(尤立星), and T Hu(胡涛) Superconducting anisotropy and vortex pinning in CaKFe4As4 and KCa2Fe4As4F2 2021 Chin. Phys. B 30 027401

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