Superconducting anisotropy and vortex pinning in CaKFe4As4 and KCa2Fe4As4F2

doi:10.1088/1674-1056/abcf98

中国物理B ›› 2021, Vol. 30 ›› Issue (2): 27401-0.doi: 10.1088/1674-1056/abcf98

收稿日期:2020-10-26 修回日期:2020-11-27 接受日期:2020-12-02 出版日期:2021-01-18 发布日期:2021-01-18

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

Received:2020-10-26 Revised:2020-11-27 Accepted:2020-12-02 Online:2021-01-18 Published:2021-01-18
Contact: ^†Corresponding author. E-mail: hutao@baqis.ac.cn
Supported by:
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).

摘要/Abstract

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 Ba_0.72K_0.28Fe₂As₂ and NdFeAsO_0.82F_0.18, 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.

Key words: iron based superconductors, vortex pinning, anisotropy

中图分类号:

74.25.Qt

75.30.Gw (Magnetic anisotropy) 74.25.Sv (Critical currents)

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. [J]. 中国物理B, 2021, 30(2): 27401-0.

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[J]. Chin. Phys. B, 2021, 30(2): 27401-0.

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[1]	査国桥, 周世平. Charged vortex structure in high-temperature superconductors[J]. 中国物理B, 2010, 19(2): 27401-027401.
[2]	刘当婷, 田野, 陈赓华, 杨乾声. Magnetic field induced phase branches of the superconducting transition in two-dimensional square π-loop arrays[J]. 中国物理B, 2008, 17(1): 311-316.
[3]	张超武, 周廉, AndreSulpice, Jean-LouisSoubeyroux, ChristopheVerwaerde, GiaKyHoang, 张平祥, 卢亚峰, 唐先德. Magnetization study of ITER-type internal-Sn Nb₃Sn superconducting wire[J]. 中国物理B, 2007, 16(6): 1764-1769.
[4]	金士锋, 王伟民, 周建坤, 国洪轩, J.F.Webb, 边秀房. Nanocrystallization behaviour of a ternary amorphous alloy during isothermal annealing: a Monte Carlo simulation[J]. 中国物理B, 2005, 14(12): 2565-2574.
[5]	廖红印, 周世平, 施晓蕴. Simulating the time-dependent Ginzburg－Landau equations for type-II superconductors by finite-difference method[J]. 中国物理B, 2004, 13(5): 737-745.
[6]	曹义刚, 焦正宽. DYNAMICS IN A DRIVEN DISORDERED VORTEX LATTICE: A NUMERICAL STUDY[J]. 中国物理B, 2000, 9(3): 199-202.
[7]	曹义刚, 焦正宽. NUMERICAL STUDIES ON THE DYNAMICS OF DISORDERED VORTEX LATTICE[J]. 中国物理B, 2000, 9(1): 61-64.
[8]	汪友梅, 曹义刚, 焦正宽. Mode-locking behaviour: ac response of a driven disordered vortex lattice[J]. 中国物理B, 2004, 13(4): 538-541.
[9]	郭树权, 王凤林, 周岳亮, 赵柏儒, 高炬. Investigation the positive moments on the M－T curve of YBCO films measured by using zero-field cooling[J]. 中国物理B, 2002, 11(4): 379-382.
[10]	周世平. GINZBURG-LANDAU THEORY AND VORTEX LATTICE OF HIGH-TEMPERATURE SUPERCONDUCTORS[J]. 中国物理B, 2001, 10(6): 541-549.
[11]	赵志文, 闻海虎, 李世亮, 倪泳明, 任治安, 车广灿, 杨海朋, 刘志勇, 赵忠贤. WEAK QUANTUM FLUX CREEP AND STRONG PINNING IN THE NEW SUPERCONDUCTOR MgB₂[J]. 中国物理B, 2001, 10(4): 340-342.
[12]	罗孟波, 焦正宽, 任清褒, 陈庆虎. INFLUENCE OF PINNING CENTRE DISTRIBUTION ON THE DYNAMICS OF TWO-DIMENSIONAL VORTEX SYSTEM[J]. 中国物理B, 2001, 10(3): 229-233.
[13]	刘钧钧, 甘子钊. FLUCTUATIONS OF FLUX LINES ON THE SURFACE OF SUPERCONDUCTOR[J]. 中国物理B, 2000, 9(12): 934-943.
[14]	. THE SIGN REVERSAL AND SCALING RELATIONS OF HALL ANOMALY IN THE MIXED STATE TYPE-II SUPERCONDUCTORS[J]. 中国物理B, 2000, 9(9): 680-684.
[15]	聂惠芬, 刘宇峰, 黄奕梅, 阎守胜. SIMULATION ON LOCAL FLUX CREEP IN TYPE-Ⅱ SUPERCONDUCTORS[J]. 中国物理B, 2000, 9(2): 141-148.