Abstract
Superconducting fluctuations on electrical conductivity of YBa2Cu3O7-δ + xBaZrO3 (x = 0.0, 2.0, 4.0, 6.0 and 10.0 wt.%.) composites are investigated from electrical resistivity versus temperature measurements in zero and 13 T magnetic field. Aslamazov–Larkin model and Lawrence and Doniach model are used to calculate the dimensions of superconducting fluctuation, crossover temperatures of paracoherent state and microscopic parameters such as interlayer coupling, c-axis coherence length and degree of anisotropy. In the absence of magnetic field, the addition of BaZrO3up to 4wt.% in YBa2Cu3O7 results in an enhancement of various crossover temperatures, interlayer coupling, coherence length and decrease in anisotropy. On application of a 13 T magnetic field, the addition of BZO in YBCO beyond 2wt.% results in the shift of various regions of the paracoherent state toward lower temperatures. However, for YBCO + 2%BZO optimum results were obtained in terms of crossover temperature, interlayer coupling, coherence length and anisotropy in the absence and in the presence of a 13 T magnetic field. This has been attributed to an increase in intragranularity of YBCO by the limited addition of BZO.
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Acknowledgements
The work was supported by IUAC, New Delhi, with research fellowship UFR-52307. The authors are also thankful to Director, UGC-DAE, Indore, for permitting magnetoresistance measurements of our samples.
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Malik, B.A., Asokan, K. & Malik, M.A. Study of Superconducting Fluctuations in YBCO + xBZO Composites. J Low Temp Phys 206, 120–130 (2022). https://doi.org/10.1007/s10909-021-02628-1
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DOI: https://doi.org/10.1007/s10909-021-02628-1