Superconducting anisotropy and vortex pinning in CaKFe4As4 and KCa2Fe4As4F2

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 gamma. While the anisotropy gamma approximate to 3 for Fe1144 is much smaller than gamma approximate to 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.

Automated summary

The study experimentally investigated the vortex pinning in two bilayer FeSCs, CaKFe4As4(Fe1144) and KCa2Fe4As4F2(Fe12442), revealing a higher flux pinning energy in Fe1144. By combining data from other FeSCs, an anti-correlation was found between the pinning energy and superconducting anisotropy in these materials, indicating the importance of interlayer interaction when considering vortex pinning in FeSCs.