Superconducting anisotropy and vortex pinning in CaKFe_(4)As_(4) and KCa_(2)Fe_(4)As4F_(2)

作     者：A B Yu Z Huang C Zhang Y F Wu T Wang T Xie C Liu H Li W Peng H Q Luo G Mu H Xiao L X You T Hu 于奥博;黄喆;张驰;吴宇峰;王腾;谢涛;刘畅;李浩;彭炜;罗会仟;牟刚;肖宏;尤立星;胡涛

作者机构：State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Beijing Academy of Quantum Information SciencesBeijing 100193China Center for High Pressure Science and Technology Advanced ResearchBeijing 100094China CAS Center for Excellence in Superconducting Electronics(CENSE)Shanghai 200050China University of Chinese Academy of SciencesBeijing 100049China Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials LaboratoryDongguan 523808China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2021年第30卷第2期

页      面：131-137页

核心收录：

学科分类：080705[工学-制冷及低温工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11574338) the National Natural Science Foundation of China–China Academy of Engineering Physics NSAF Joint Fund(Grant No.U1530402) 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) the Youth Innovation Promotion Association of CAS(Grant No.2016004) 

主　　题：iron based superconductors vortex pinning anisotropy 

摘      要：The vortex pinning determining the current carrying capacity of a superconductor is an important property to the applications of superconducting *** 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 ***,based on the transport and magnetic torque measurements,we experimentally investigate the vortex pinning in two bilayer FeSCs,CaKFe_(4)As_(4)(Fe1144)and KCa_(2)Fe_(4)As4F_(2)(Fe12442),and compare their superconducting anisotropyγ.While the anisotropyγ≈3 for Fe1144 is much smaller thanγ≈15 in Fe12442 around Tc,a higher flux pinning energy as evidenced by a higher critical current density is found in Fe1144,as compared with the case of *** combination with the literature data of Ba_(0.72)K_(0.28)Fe2As_(2) and Nd Fe As_(O0.82)F_(0.18),we reveal an anti-correlation between the pinning energy and the superconducting anisotropy in these Fe *** results thus suggest that the interlayer interaction can not be neglected when considering the vortex pinning in Fe SCs.