Abstract
We report detailed studies of the normal-state resistivity and Hall effect in pure, Pr-doped, and Ca-doped RBa 2 Cu 3 O 7-y systems (R= rare-earth element). We found a linear temperature dependence of the normal-state resistivity p and the Hall number n H above T c . At a constant temperature both p and n H are dependent on ionic radius of rare earth, r R3+ , viz., the larger R 3+ ionic radius, the larger ρ (ρ∝r R3+ ), but the lower n H (n H ∝ 1/r R3+ ). The experimental data of ρ and n H at a fixed temperature for different samples of pure, Pr-doped and Ca-doped RBa 2 Cu 3 O 7-y , follow the common relation ρ∝1/n H . X-ray-diffraction data indicate that the rare-earth ion size dependence of ρ and n H in these systems is correlated with the lattice size dependence of these quantities.