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We report the growth and characterization of single crystals of ironchalcogenide superconductor FeCr$_{0.02}$Se. There is an enhancement of thesuperconducting transition temperature (T$_{\rm c}$) as compared to the T$_{\rmc}$ of the single crystals of the parent compound Fe$_{1+x}$Se by about 25%.The superconducting parameters such as the critical fields, coherence length,penetration depth and the Ginzburg-Landau parameter have been estimated forthese single crystals. Analysis of the critical current data suggests afluctuation in electronic mean free path induced ($\delta l$) pinning mechanismin this material. Thermally activated transport across the superconductingtransition in the presence of external magnetic fields suggests a crossoverfrom a single vortex pinning regime at low fields to a collective flux creepregime at higher magnetic fields. The nature of charge carriers in the normalstate estimated from the Hall effect and thermal transport measurements couldprovide crucial information on the mechanism of superconductivity in Fe-basedmaterials.

Growth, Characterization, Vortex Pinning and Vortex Flow Properties of Single Crystals of Iron Chalcogenide Superconductor FeCr$_{0.02}$Se