Polycrystalline samples of Nd 1-x Ca x Ba 2-x La x Cu 3 O 7-δ (with 0.0 ≤ x ≤ 0.15) were prepared by the standard solid state method. The co-doping effect was studied on the resistivity as a function of temperature and doping concentration x. The fluctuation conductivity was analyzed using the Aslamazov and Larkin model (AL). For all samples, three fluctuation regions; i.e. one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D), were clearly observed with decreasing temperature. A critical region was also observed for high doping concentration (x ≥ 0.1). Superconductivity parameters such as the effective coherence length ξ p , the coherence length along the c-axis ξ c and ab plane ξ ab , the effective interlayer separation d, anisotropy parameter γ a , and the upper critical magnetic field B c2 along the c-axis and ab plane were obtained. It was also found that CuO x chains contribute to conducting.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.