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Anisotropic superconducting properties including the upper critical fieldHc2, thermal activation energy U0, and critical current density Jc aresystematically studied in a large Ca1-xLaxFeAs2 single crystal (x ~ 0.18). Theobtained Hc2 bears a moderate anisotropy gamma of approximately 2-4.2, locatedbetween those of '122' Ba1-xKxFe2As2 (1 < gamma < 2) and '1111' NdFeAsO1-xFx (5< gamma < 9.2). Both the magnitude of U0 and its field dependence are verysimilar to those of NdFeAsO1-xFx, also indicating anisotropicsuperconductivity. Moreover, high and anisotropic Jc's exceeding 10^5 A/cm2have been calculated from the magnetization hysteresis loops, indicating theexistence of strong bulk-dominated pinning in the present superconductingmaterial.

Anisotropic Superconductivity of Ca1-xLaxFeAs2 (x ~ 0.18) Single Crystal