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    • Keywords

       

      Hole conductivity; Hall constant; bismuth cuprates; iron-substituted YBaCuO; n-type; bi-polaron; Hirsch model

    • Abstract

       

      Hall constants (RH) at 300 K of three families of CuO-based superconductors are presented—the 123 YBaCuO with Fe substitution, the 2212 and 2223 Bi systems with Pb, Gd, Nd. Sm substitutions. In all these systems.RH is positive indicating hole conductivity.Tc increases initially as the hole density (p=1/RHe) increases and shows a maximum. Each family shows a maximum value ofTc but at different values ofp. These data along with the observation ofn-type conductivity in NdCeCuO are discussed in the light of certain models.

    • Author Affiliations

       

      R Suryanarayanan1 M Rateau1 O Gorochov1 G Priftis1 2 H Pankowska1 L Ouhammou1

      1. Laboratoire de Physique des Solides de Bellevue CNRS, Meudon - 92195, France
      2. Physics Department, University of Patras, Patras - 26110, Greece
    • Dates

       
  • Bulletin of Materials Science | News

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