ANISOTROPIC SUPERCONDUCTIVITY OBSERVED FOR Y1Ba2Cu3Oy SINGLE CRYSTALS BY TORQUE MAGNETOMETRY H. Miyajima, H. Tomita, Y. Otani, F. Yonezama, S. Chikazumi, H. Takeya and H. Takei J. Phys. Colloques, 49 C8 (1988) C8-2185-C8-2186 DOI: 10.1051/jphyscol:19888980