Abstract
Synthesis and characterization of (CuO) x /Cu0.5Tl0.5Ba2Ca2Cu3O10−δ ; {(CuO) x /CuTl-1223} composites with x=0 %, 10 %, 15 % and 20 % have been reported. The fluctuations induced conductivity (FIC) analysis of (CuO) x /CuTl-1223 composite has been carried out using Aslamazov-Larkin (AL) and Lawrence-Doniach (LD) models in the temperature regime well above the critical temperature (T>T c ). The electrical resistivity versus temperature curves of as-prepared and oxygen post-annealed (CuO) x /CuTl-1223 composite were fitted by using above mentioned models to extract the microscopic parameters such as zero temperature coherence length along c-axis{ξ c (0)}, inter-layer coupling (J), dimensional critical exponent (λ) and inter-grain coupling constant (α) etc. It has been observed that the cross-over temperature (T o ) fits very well the two-dimensional (2D) and three-dimensional (3D) AL equations and shifts towards the lower temperature regime with the enhanced weight percentage of CuO nano-particles. The shifting of AL 3D region to higher temperature after oxygen post-annealing indicates the restoration of oxygen and optimization of charge carriers in conducting CuO2 planes. The gradual decrease in the value of inter-grain coupling constant (α) with the increase of CuO nano-particles content reflects an improvement in the inter-grain coupling resulting into an increase in the coherence length (ξ c ) along the c-axis. Almost all superconductivity parameters have been improved after oxygen post-annealing. The suppression of superconductivity parameters in the composite with x=20 % limits the optimum doping level of CuO nano-particles in (CuO) x /CuTl-1223 composite.
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Mumtaz, M., Bhatti, A.I., Nadeem, K. et al. Study of CuO Nano-particles/CuTl-1223 Superconductor Composite. J Low Temp Phys 170, 185–204 (2013). https://doi.org/10.1007/s10909-012-0741-1
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DOI: https://doi.org/10.1007/s10909-012-0741-1