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Fluctuation induced conductivity studies in YBa2Cu3Oy compound embedded by superconducting nano-particles Y-deficient YBa2Cu3Oy: effect of silver inclusion

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Abstract

The effect of superconducting Y-deficient YBa2Cu3Oy nano-particles prepared by the planetary ball milling technique and silver inclusion on electrical fluctuation conductivity of polycrystalline YBa2Cu3Oy has been reported. Samples, synthesized by the conventional solid-state reaction technique, have been investigated using X-ray diffraction, scanning electron microscope and electrical resistivity. Scanning electron microscope analyses show that nano-particles of Y-deficient YBa2Cu3Oy are embedded in the superconducting matrix. The density of these nano-particles strongly depends on milling parameters. The fluctuation conductivity has been analyzed as a function of reduced temperature using the Aslamazov–Larkin model. Three different fluctuation regions namely critical, mean-field and short-wave are observed. The zero-temperature coherence length, the effective layer thickness of the two-dimensional system, critical magnetic fields and critical current density are estimated. Superconducting parameters are affected by Y-deficient YBa2Cu3Oy nano-particles. It has been found that attainment of an optimum concentration and well-dispersed of nano-sized inclusions by ball milling process improves the physical properties. On the other hand, the sample with Y-deficient YBa2Cu3Oy nano-particles and Ag exhibits better superconducting properties in comparison with free added one.

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Authors and Affiliations

  1. Laboratory of Physics of Materials - Structure and Properties, Department of Physics, Faculty of Sciences of Bizerte, University of Carthage, 7021, Zarzouna, Tunisia

    E. Hannachi, Y. Slimani, M. K. Ben Salem, A. Hamrita, M. Ben Salem & F. Ben Azzouz

  2. Department of Physics, College of Sciences for Girls, University of Dammam, Dammam, Saudi Arabia

    A. L. Al-Otaibi, M. A. Almessiere & F. Ben Azzouz

Authors
  1. E. Hannachi
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  2. Y. Slimani
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  3. M. K. Ben Salem
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  4. A. Hamrita
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  5. A. L. Al-Otaibi
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  6. M. A. Almessiere
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  7. M. Ben Salem
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  8. F. Ben Azzouz
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Correspondence to M. Ben Salem.

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Hannachi, E., Slimani, Y., Ben Salem, M.K. et al. Fluctuation induced conductivity studies in YBa2Cu3Oy compound embedded by superconducting nano-particles Y-deficient YBa2Cu3Oy: effect of silver inclusion. Indian J Phys 90, 1009–1018 (2016). https://doi.org/10.1007/s12648-016-0839-4

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  • DOI: https://doi.org/10.1007/s12648-016-0839-4

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