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Infield superconducting properties of {(Ag) x /CuTl-1223}; (x = 0, 0.5, 1.0, 2.0 and 4.0 wt %) nanoparticles-superconductor composites were investigated under different applied magnetic field up to H = 8 T. The increase in critical temperature {T c (0)} and decrease in normal state resistivity (ρ o ) were observed with increasing contents of Ag nanoparticles in CuTl-1223 superconducting matrix. The value of T c ° nset (K) remained almost unaffected by applying external magnetic field, but a decreasing trend in T c (0) was observed by increasing the value of external applied magnetic field. The transition region below T c ° nset (K) showed Arrhenius behavior due to thermally activated flow of magnetic vortices. Enhancement in flux flow activation energy (U o ) and suppression in transition width (ΔT) of CuTl-1223 phase with addition of Ag nanoparticles showed the improvement in flux pinning strength of superconductor. [ABSTRACT FROM AUTHOR]