CORRELATION OF CARRIER-CONCENTRATION AND SUPERCONDUCTING TRANSITION IN DY1-XPRXBA2CU3O7

The Thermoelectric power (S) and superconducting transition temperatur e (T-c) have been systematically measured for a series of (Dy1-xPrx)Ba 2Cu3O7-delta with x from 0 to 0.7. Our results show that S increases p rogressively with increasing x while T-c decreases. By using the empir ical relation between S and the carrier concentration (n), n has been extracted. The result shows a clear linear reduction of n with increas ing x for x > 0.15. Our T-c-n relation shows a remarkable agreement wi th the universal parabolic T-c-n relation, demonstrating that the T-c- suppression with Pr-doping comes dominantly from the hole depletion ef fect.