Codoping Effect of Zn and Pr in YBa2Cu3O7-δ

In this paper we present the resistivity data for Pr and Zn codoped compound Y1-xPrxBa2[Cu1-yZny]3O 7-δ with 0 < y < 0.1 and x = 0.0, 0.1 and 0.2.The data is analysed in terms of the superconducting critical temperature Tc, residual resistivity ρ0 and the resistivity slope dρ/dT corresponding to the linear ρ-T region.It is found that for x = 0.1 Pr has a minimal influence on the in-plane processes for Zn impurity alone affecting slightly Tc and ρ0.The slope dρ/dT becomes larger for 0.03 < y < 0.06 leading to larger depining effect and hence slower fall of Tc as a function of y.For x = 0.2 there is a drastic change, ρ0 becomes abnormally large, dρ/dT becomes negative implying absence of depinning and a totally pinned charge stripes.Superconductivity vanishes at y = 0.03.It is concluded that for x = 0.2 Pr converts the system from overdoped to underdoped region leading to the universal superconductor-insulator transition.