Abstract
Magnetic properties were studied for the high-quality Al-free orthorhombic Gd 1− x Pr x Ba 2Cu 3O 7− y single crystals (0⩽ x⩽1.0) grown by the flux method. An indication of the interaction between 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 method seems to be connected with partial substitution of Ba for the Pr-sites.
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