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In this paper, we report the synthesis, structure, transition temperature,upper critical field, critical current density and thermally activated fluxflow in CaFFe0.9Co0.1As superconductor. Superconductivity arises at 23 K by Cosubstitution at the site of Fe atoms and upper critical field is estimated 102T by using the Werthamer-Helfand-Hohenberg formula. The flux-flow activationenergy (U0/kB) varies from 3230 K and 4190 K in the field of 1 T and 9 Trespectively. At 2K, the Jc is found to be approximately 4x10^3A/cm^2 and0.3x10^3 A/cm&^2 in zero and 6T field, respectively. Transmission electronmicroscopy analysis shows an amorphous region surrounding around most of thegrains which is likely to be present in the form of amorphous and weak linkgrain boundaries in this compound. It seems that most of the current ishindered by miss aligned grains, amorphous grain boundaries and impurities,which are invariably found between the grains. Presence of the weakly linkedgranules and their weakly pinned intergranular Josephson vortices areresponsible for both low Jc and the Arrhenius temperature dependence ofresistivity

Upper critical field, critical current density and thermally activated flux flow in CaFFe0.9Co0.1As superconductor