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Single crystal growth of the Bi2.2Sr2CaCu2Ox superconductor by the traveling solvent floating zone method has been performed with the intension of obtaining large single crystals with high quality and elevating the superconductive transition temperature, Tc. The oxygen partial pressure of growth atmosphere, PO2, and the composition ratio, Sr/Ca, were varied in the crystal growth. The thickness of the crystal in the crystal growth decreased with decreasing oxygen pressure below 22kPa, while no distinct change was observed in the resulting crystals in the range of 22-100kPa. The thickness was the largest at Sr/Ca=1.4. The lattice image of the single crystal by a high resolution TEM with no intergrowth revealed the extremely high quality of the crystal. Mechanism of the crystal growth is discussed.

Influence of Partial Oxygen Pressure and Sr/Ca Ratio on the Single Crystal Growth of the Bi2Sr2CaCu2Ox Superconductor.