Abstract
Hall constants (R H) 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.R H is positive indicating hole conductivity.T c increases initially as the hole density (p=1/R He) increases and shows a maximum. Each family shows a maximum value ofT c but at different values ofp. These data along with the observation ofn-type conductivity in NdCeCuO are discussed in the light of certain models.
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