In La-doped CaKFe4As4 single crystals, the critical current density peaks at x about 0.082, reaching about 0.34 MA/cm2 at 5 K and 40 kOe, roughly four to five times the undoped value.
We examined the actual composition of our crystals using SEM-EDX for both La (La/(La+Ca) as actual x) and Co dopings (Co/(Co+Fe) as actual x)
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Evolution of Critical Current Density in CaKFe$_4$As$_4$ with La-doping
In La-doped CaKFe4As4 single crystals, the critical current density peaks at x about 0.082, reaching about 0.34 MA/cm2 at 5 K and 40 kOe, roughly four to five times the undoped value.