低温形成Bi-Sr-Ca-Cu-O薄膜の結晶構造
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概要
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Thin films of Bi-Sr-Ca-Cu-O system were prepared at the substrate temperature between 550°C and 600°C. The film deposited at 570°C showed X-ray diffraction pattern of Bi<SUB>2</SUB>Sr<SUB>2</SUB>Ca<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>y</SUB> phase and had a zero resistance temperature T<SUB>c</SUB> at 23K. After annealing at 570°C under the oxygen pressure of 1 atm, zero resistance temperature T<SUB>c</SUB> increased to 45K, but under the pressure of 0.1 atm, the crystal structure was changed and nonconducting Ca-Cu-O phase appeared.
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