In order to examine the dependence of the superconducting property of the double Cu-O layer system on the hole concentration, we measured the superconducting transition of Bi2Sr2Ca1-xYxCu2Oy (0 ≤ x ≤ 0.4) compounds in terms of complex susceptibility, χ = χ′ - iχ″. The samples were systhesized by a citrate sol-gel precursor technique. The main advantages of this method are the shorter reaction time, the elimination of some steps such as centrifugation, and a fine control of pH. X-ray diffraction analysis showed that each sample has a single phase, although χ for x=0.1 indicates the existence of different superconducting phases. It has been revealed that the superconducting transition temperature Tc apparently depends on the hole concentration, and the highest Tc(95.2 K) was achieved for around x=0.1. The profiles of χ for five samples with different values of x are discussed.
|ジャーナル||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|出版ステータス||Published - 1991|
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