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 found that the c-axis length does not change significantly with the doping amount
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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.