Fig. 3
From: Unique defect structure and advantageous vortex pinning properties in superconducting CaKFe4As4
Critical current properties of CaK1144 single crystal for H // ab in comparison with BaK122 (x = 0.4). a, b MHLs at T = 3–34 K and magnetic field dependence of Jc for CaK1144. c, d Same data set as in a, b for BaK122. e Temperature dependence of Jc for CaK1144 (red) and BaK122 (blue) under H // ab (filled) and c (open). Jc data of Co-Ba12220 and Nd111133 thin films are plotted for comparison. Note that Jc of Co-Ba122 film is almost isotropic. f Temperature dependence of Jc anisotropy defined as JcH//ab/JcH//c
