• Low percolation concentration for zero thermoelectric power in Y1Ba2Cu3O7−x

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      https://www.ias.ac.in/article/fulltext/boms/014/03/0837-0845

    • Keywords

       

      Percolation threshold; thermoelectric power; oxide superconductors; Josephson coupling

    • Abstract

       

      Effect of oxygen deficiency on the thermoelectric power and the resistive transition is studied by changing the cooling rate of the sintered specimens of R1Ba2Cu3O7−x where R=Y, Gd and Sm. Slow-cooled (60°C/h) specimens are superconducting and show positive TEP with a broad peak aboveTc. It is a decreasing function of temperature at higher temperatures. Pair fluctuation aboveTc is thought to be responsible for this peak. Highly O2-deficient sample of Y123 has a finite resistivity atTc and yet shows a zero TEP. It is suggested that the percolation concentration of the superconducting phase for zero TEP should be much smaller than that required for the electrical conduction.

    • Author Affiliations

       

      S R Jha1 Y S Reddy1 R G Sharma1

      1. National Physical Laboratory, New Delhi - 110 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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