Abstract
The influences of Pr at Y- and Ba-sites on the superconductivity of YBa 2Cu 3O y were studied comparatively. It is found that Pr at Y- and Ba-sites exhibit different T c-depression behaviors. For the systems of Y 1− x Pr x Ba 2Cu 3O y , Y 1−2 x Pr x Ca x Ba 2Cu 3O y and YBa 2− x Pr x Cu 3O y , the T c vs. x relations can be fitted by the equations of T c=92.3−105.9 x 2−81.7 x, T c=90−94.2 x and T c=90−567.7 x 2−7.52 x, respectively. The parabolic term represents hole the filling effect, and the linear term describes depairing effect. The depression in superconductivity of Pr at Y-sites is due to both hole filling and depairing effects. However, Pr at Ba-sites seems to be due to hole filling only. The analysis of bond valence sums (BVS) suggests that the substitution of Pr for Ba affect indirectly through O4 sites on the hole concentration of CuO 2 plane.
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