Preparation and Characterization of Ba-Y-Cu-O Single Crystals

Single crystals of Ba 2 YCu 3 O 7- y were prepared from molten Ba-Y-Cu-O. The shape of the crystals was thin rectangular slab and the size of the largest crystal was 1.5×1.5×0.04 mm 3 . The crystals were characterized by resistivity measurement, Meissner effect study and structure analysis. Superconductivity was found with transition temperature of about 90 K by resistivity measurement. The resistivity parallel to the c -axis is 30-90 times larger than in-plane resistivity just above T c . The Meissner effect was also observed in the same sample. The unit cell was orthorhombic with space group Pmmm and the lattice parameters a = 3.857(1), b = 3.865(1) and c = 11.723(4) Å.

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