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    Title: Superconductivity in the La3CaxBa3Cu6+xOy System
    Other Titles: La3CaxBa3Cu6+xOy系統的超導性
    Authors: 高惠春;Kao, H. C. I.;Yang, Y. F.;王啟銘;Wang, C. M.
    Contributors: 淡江大學化學學系
    Date: 1992-06-01
    Issue Date: 2009-12-01
    Publisher: 台北:中華民國物理學會
    Abstract: Superconductive samples with nominal compositions La3CaxBa3Cu6+xOy (1≤x≤5) were prepared. The best superconductivity with T c (zero) = 80.0 K and ∆Tc = 1.5 K was found in the sample having x = 1; the composition was La3CaBa3Cu7O155+δwhich had a tetragonal tripleperovskite structure with unit cell dimensions a = 3.88A and c = 11.64A. Only one superconducting phase, La3CaBa3Cu7O155+δwas observed in these superconducting samples. Unlike theTl-Ca-Ba-Cu-O or Bi-Ca-Sr-Cu-O oxidesystems, the complexity of the superconductingphase in the La3CaxBa3Cu6+xOy series was not increased for x≥2. The amount of impurities, such as Ca2CuO3, gradually increased with x≥2. Tc of La3CaxBa3Cu6+xOy decreased with decreasing volume of the unit cell of the superconducting phase; this effect probably resulted from the substitution of further Ca atoms at the Ba and La sites.
    Relation: Chinese Journal of Physics 30(3), pp.423-428
    Appears in Collections:[化學學系暨研究所] 期刊論文

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