Abstract
Pr-substitution effect on superconductivity is investigated for the samples of Gd 1−xR xBa 2Cu 3O 7−z (R=Pr Nd) through the measurements of lattice parameter, susceptibility, electric resistivity and ESR. With increasing R, lattice parameter c increases for R=Nd but decreases for R=Pr although these ion radius follows Gd 3+<Nd 3+<Pr 3+, suggesting presence of Pr 4+ ions. The lattice parameter ratio c/a varies considerably for R= Pr but not for R= Nd, implying anisotropic change of lattice parameter in the Pr-substituted samples. These results indicate the presence of both Pr 3+ and Pr 4+ ions, and also hybridization between Pr 3+4f and O2pσ orbitals which leads to covalent bonding along c axis.
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