Optimization of Single Crystal Preparation of Bi2Sr2CaCu2Ox Superconductor by the Travelling Solvent Floating Zone Method

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Abstract
Optimization of single crystal preparation of the Bi2.2(Sr, Ca)2.8Cu2.0O y superconductor by the travelling solvent floating zone method has been performed with the intention of obtaining large single crystals and improving the superconductive transition temperature, T c. The composition ratio, Sr/Ca, and the oxygen partial pressure of growth atmosphere, PO2 , were varied in the crystal growth. A single crystal typically obtained was a thin plate of the dimensions of 5×50×2 mm3. The thickness of the crystal was the largest in the crystal growth at Sr/Ca=1.4, while no distinct change was observed in the resulting crystals in the range of 22∼100 kPa. Electric and magnetic properties, the formal charge of copper ions and existence of ion defects are discussed.