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    題名: Effect of Pr and Ca substitution on the (La1-x-uPrxCau)(Ba1.5Sr0.5)Cu3Oy superconductors
    作者: Lin, C. H.;高惠春;Kao, H. C. I.
    貢獻者: 淡江大學化學學系
    日期: 2003-05
    上傳時間: 2009-12-01
    出版者: Springer
    摘要: In the fully oxygenated single phase (La1−x−uPrxCau)(Ba1.5Sr0.5)Cu3Oy (0≤x≤1.00, 0≤u≤0.20) system, if u=0, the z-coordinate of the Ba site, z(Ba), and dBa–bp (distance between the Ba site and the basal plane) are lowered by increasing the amount of Pr in the (La1−xPrx)(Ba1.5Sr0.5)Cu3Oy series. On the contrary, if u≠0, z(Ba) and dBa–bp are raised by increasing the amount of Ca ion in the (La1−x−uPrxCau)(Ba1.5Sr0.5)Cu3Oy (0≤x≤0.30, 0≤u≤0.20) series. Linear relationships are found between z(Ba), dBa–bp and the oxygen stoichiometry (y). Tc and psh (the hole concentration in CuO2 layers) increase with increasing the angle of Cu(2)-Ba-Cu(2). Relative positions of the Cu(2) and Ba sites are important in determining the Tc of these 123 compounds.
    關聯: Journal of low temperature physics 131(3-4), pp.719-724
    DOI: 10.1023/A:1022917117764
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文


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