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. 2016 Mar 7;6:22278. doi: 10.1038/srep22278

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(a,b) Magnetic field (H) dependence of magnetization and critical current density J_s at various temperatures. H is applied along the crystal’s c-axis. Large J_s value over 2*10⁶A/cm² was obtained at T = 5 K. Inset in (b) shows J_s(H) for sample Ca_0.8La_0.2Fe_1−xCo_xAs₂ (x = 0.044) within a log-log plot. H_s is defined as the upper critical point for single-vortex region in which J_s is field-independent.