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Effect of Ti Doping on Structural and Superconducting Property of YBa2Cu3O7−y High T c Superconductor

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Abstract

Dimensional fluctuations of superconducting order parameters in YBa2(Cu1−x Ti x )3O7−y (x=0.01, 0.02, 0.04, 0.05) have been analyzed. SEM micrographs reveal the reduced grain size and the formation of TiO2 nanowires covering over the grains of YBCO matrix. XRD graphs show the unchanged orthorhombic structure. With the increase of TiO2%, it is found that the superconducting transition temperatures determined from standard four-probe method decrease gradually. Excess conductivity fluctuation analysis using the Aslamazov–Larkin model fitting reveals transition of two dominant regions (2D and 3D) above T c . 2D to 3D crossover temperature, i.e., the Lawerence–Doniach temperature that demarcates dimensional nature of fluctuation inside the grains is influenced by Ti incorporation in YBCO matrix. The decrease in the Lawerence–Doniach temperature in the mean field region has been observed as a consequent dominance of 3D region with increase in Ti%.

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The authors gratefully acknowledge the Department of Science and Technology, Government of India, for providing fellowship to carry out this work.

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  1. Department of Physics, National Institute of Technology, Rourkela, 769008, India

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Sahoo, M., Behera, D. Effect of Ti Doping on Structural and Superconducting Property of YBa2Cu3O7−y High T c Superconductor. J Supercond Nov Magn 27, 83–93 (2014). https://doi.org/10.1007/s10948-013-2269-2

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