Effects of Cu substitution by Zn on transport properties of Y1Ba2Cu3O7-δ

The authors report the temperature dependence of resistivity and the Hall coefficient RH of a series of Y1Ba2(Cu1-xZnx)3O7-δ ceramics with x up to 0.075. In all their samples they have observed linear temperature dependence of (eRH)-1. The slope, d(eRH)-1/dT, decreases with the increase in Zn concentration, while the intercept (eRH)-1 at T⇒0 increases. These changes, together with a decrease of α=(∂ρ/∂T)ρ-1 due also to the Cu substitution, provokes the flattening in the temperature dependence of the Hall mobility. The analysis of the data shows that one cannot consider Zn as a simple charge donor for Y1Ba2Cu3O7-δ, but more complex change in the mechanism of transport seems to be introduced by the Cu substitution