Abstract
The co-doping effect of Zn and Pr impurities in the compounds of composition Y 1-x Pr x Ba 2[ Cu 1-y Zn y]3 O 7-δ with x = 0.1, x = 0.2 and 0 ≤ y ≤ 0.1 has been investigated by analyzing the results of electrical resistivity measurements. It is found that for Pr substitution at x = 0.1, there is a minimal influence on in-plane processes, thereby slightly affecting Tc and residual resistivity ρ0, but with the resistivity slope dρ/dT becoming large for the range of y from 0.03 to 0.06, leading to a larger depinning effect. For x = 0.2 a drastic change is observed whereby ρ0 becomes abnormally large, and dρ/dT becomes negative, implying totally pinned charge stripes and no depinning. This second observation therefore suggests that Pr substitution converts the overdoped system to an optimally doped system, leading to the universal superconductor–insulator transition.
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