HALL-EFFECT IN BULK YBA2(CU1-XZNX)3O7-DELTA

The Hall effect and the electrical resistivity have been measured in b ulk samples having the general composition YBa2(Cu1-xZx)3O7-delta for 0 < x < 0.06, in the temperature range 20-300 K, and for magnetic fiel ds up to 5 T. The linear temperature dependence of the resistivity was observed for all the doped samples between 100 and 300 K. The tempera ture dependence of the carrier concentration and the T2 dependence of the inverse Hall mobility [mu(H)-1(T2)] show an anomaly at a temperatu re around 230 K. These results are discussed in the framework of exist ing theories.