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<p>We have investigated how the low concentrations of ferromagnetic Co-nanoparticles in intergranular networks of multi-layered Y<sub>3</sub>Ba<sub>5</sub>Cu<sub>8</sub>O<sub>18-δ</sub> (Y358) superconductor affect the coherence length (<i>ξ</i><sub>c</sub>) at absolute zero temperature and critical current density, <i>J</i><sub>c</sub>, near the superconducting phase transition region. Fluctuation-induced conductivity (FIC) is used to extract <i>ξ</i><sub>c</sub> (0). An increasing trend of <i>ξ</i><sub>c</sub> (0) with increasing concentration of Co is observed, attributed to the deterioration of the superconducting properties. We have extracted <i>J</i><sub>c</sub> from current–voltage (<i>IV</i>) characteristics in the phase transition region. Reduction in <i>J</i><sub>c</sub> has also been observed with increasing the concentration of Co-nanoparticles.</p>

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Coherence Length and Transport Critical Current Density in Y3Ba5Cu8O18-δ/Co Composite Superconductor

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Ipsita Mukherjee,
  • Ajay Kumar Ghosh

摘要

We have investigated how the low concentrations of ferromagnetic Co-nanoparticles in intergranular networks of multi-layered Y3Ba5Cu8O18-δ (Y358) superconductor affect the coherence length (ξc) at absolute zero temperature and critical current density, Jc, near the superconducting phase transition region. Fluctuation-induced conductivity (FIC) is used to extract ξc (0). An increasing trend of ξc (0) with increasing concentration of Co is observed, attributed to the deterioration of the superconducting properties. We have extracted Jc from current–voltage (IV) characteristics in the phase transition region. Reduction in Jc has also been observed with increasing the concentration of Co-nanoparticles.