Abstract
The research focuses on the growth of iron-based superconducting Ca0.82Pr0.18Fe2As2 single crystal and the influence of the thermal fluctuation on the superconductivity. The single crystal was grown by self-flux method. We confirm that the crystal has ThCr2Si2-type structure with I4/mmm space group. By using Energy Dispersive Spectroscopy we confirm the Pr、Ca、Fe、As elements in the specimen. A standard four-wire technique was used to measure the temperature dependence of resistivity. The transition region is broadened by the external magnetic fields. We observed a superconducting transition temperature of 49K under zero magnetic field. Extremely short lower critical field HC1 of ~ 1Oe is found in the initial stage of hysteresis loop measurement. The upper critical fields derived from the Thermal Fluctuation Scaling Analysis & charge-exchange mechanism is found to be 80 T for the applied field along the ab-plane and 35 T for the applied field along the c-axis. The anisotropic superconducting coherence lengthξand penetration depthλ are then discussed.
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