Abstract:
In this paper we present the resistivity data for Pr and Zn codoped compound Y(1-x)Pr(x)Ba(2) [Cu(1-y)Zn(y)](3)O(7-delta) with 0 less than y less than 0:1 and x = 0.0, 0.1 and 0.2. The data is analysed in terms of the superconducting critical temperature T(c), residual resistivity po. and the resistivity slope dp/dT corresponding to the linear p-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 p0. The slope dp/dT becomes larger for 0.03 less than y less than 0.06 leading to larger depining effect and hence slower fall of T(c) as a function of y. For x = 0.2 there is a drastic change, p0 becomes abnormally large, dp/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.
