The effect
of Pr and Gd doping on the transport properties of Cu-deficient YBCO
superconductors has been studied. Two series of Y1Ba2Cu3 - xRxO7 - δ,
where R = Pr or Gd, were prepared by the conventional solid-state reaction
technique. Resistance measurements showed a suppression of Tc with
increasing of Pr- and Gd-contents in addition to a normal-state
metal-to-insulator transition. Moreover, a superconductor-to-insulator
transition has been observed at ambient pressure for temperatures less than 50
K for Pr with x = 0.3 and for Gd with x > 0.3. The overall complex
behaviours of the resistivity data have been preliminary explained in terms of
localization of charge carriers, structural disorders, and magnetic ordering of
magnetic moments.
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