Superconducting anisotropy and vortex pinning in CaKFe4As4 and KCa2Fe4As4F2

• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: RAPID COMMUNICATION
• 页码范围: 143-150
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/abcf98

摘要

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 in-vestigated 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 y.While the anisotropy γ≈ 3 forFe1144 is much smaller than γ ≈ 15 in Fe12442 around Tc,a higher flux pinning energy as evidenced by a higher critical current density is found in Fel144,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.