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Inhomogeneity Induced Conductivity Fluctuation in YBa2Cu3O7−y /Cr2O3 Composite

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Abstract

Dimensional fluctuations of superconducting order parameters in YBa2Cu3O7−y +xCr2O3 (x=0.0, 2.3, 4.4, and 6.1 wt.%) has been analyzed. SEM micrographs reveal the reduced grain size with the incorporation of magnetic Cr2O3 particles in the YBCO matrix. XRD graphs show the unchanged orthorhombic structure and improved oxygen ordering in the composite samples. With the increase of Cr2O3 wt.%, it is found that the superconducting transition temperatures determined from standard four-probe method decreases gradually. Excess conductivity fluctuation analysis using Aslamazov–Larkin model fitting reveals transition of two dominant regions (2D and 3D) above T c . 2D to 3D crossover temperature, i.e., Lawerence–Doniach temperature that demarcates dimensional nature of fluctuation inside the grains is influenced by Cr2O3 incorporation in YBCO matrix. The decrease in Lawerence–Doniach temperature in the mean field region has been observed as a consequent dominance of the 3D region with an increase in wt.% of Cr2O3 in the composite.

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Acknowledgements

The authors gratefully acknowledge the Department of Science and Technology, and the 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

    M. Sahoo & D. Behera

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  1. M. Sahoo
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Correspondence to M. Sahoo.

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Sahoo, M., Behera, D. Inhomogeneity Induced Conductivity Fluctuation in YBa2Cu3O7−y /Cr2O3 Composite. J Supercond Nov Magn 26, 3017–3025 (2013). https://doi.org/10.1007/s10948-013-2116-5

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