Magnetic properties of Gd1-xPrxBa2Cu3O7-y single crystals

Magnetic properties were studied for the high-quality Al-free orthorhombic Gd1-xPrxBa2Cu3O7-y single crystals (0 less than or equal to x less than or equal to 1.0) grown by the flux method. An indication of the interaction be tween the Pr and Cu(2) magnetic sublattices was found for Pr123, Different sign of magnetic anisotropy was established for the Pr and Gd ions at low T . It was also shown that the superconductivity reported by Zou et al. [Phys . Rev. Lett. 80 (1998) 1074] for Pr123 single crystals grown by the TSZF me thod seems to be connected with partial substitution of Ba for the Pr-sites . (C) 2000 Elsevier Science B.V. All rights reserved.