教師資料查詢 | 類別: 期刊論文 | 教師: 高惠春 KAO, HUEY-CHUEN (瀏覽個人網頁)

標題:Correlation of Tc with compositions in the (La1−x−zCaxPrz)(Ba1.5Sr0.5)Cu3Oy superconducting series
學年90
學期1
出版(發表)日期2001/11/01
作品名稱Correlation of Tc with compositions in the (La1−x−zCaxPrz)(Ba1.5Sr0.5)Cu3Oy superconducting series
作品名稱(其他語言)
著者Kao, H.-C. I.; Lin, C. H.
單位淡江大學化學學系
出版者Amsterdam: Elsevier BV * North-Holland
著錄名稱、卷期、頁數Physica C: Superconductivity and its Applications 364-365, pp.575-581
摘要Fully oxygenated single phase (La1-x- zCaxPrz)(Ba1.5Sr0.5)Cu3Oy compounds with tetragonal triple-perovskite structure were prepared by a solid state reaction method. In the Pr series, The Tc of (La1- zPrz)(Ba1.5Sr0.5)Cu3Oy quickly dropped from 54 K for /z=0 and the samples became non-superconducting for /z>0.30. However, in the Ca series, the Tc of (La1- xCax)(Ba1.5Sr0.5)Cu3Oy increased from 54 K for /x=0 to 73 K for /x=0.20. With the amount of Pr ion kept constant, the Tc of (La1-x- zCaxPrz)(Ba1.5Sr0.5)Cu3Oy was also increased by increasing the amount of Ca ion in each series. Assuming 20% of Pr ions to be present in the tetravalent state, we calculated the hole concentration in the CuO2 layer, psh, for all the compounds, which was then correlated with Tc. By introducing Ca ions into La sites, Tc and the hole concentration in the CuO2 layer were both also increased. On the other hand, introducing Pr4+ ions into the La sites by fully oxygenating the samples leads to a decreased hole concentration in the CuO2 layer. The hole doping and filling effects caused by the Ca2+ and Pr4+ ions, respectively, were demonstrated. At constant psh, Tc is decreased with increasing amount of Pr ions, indicating a further deterioration of superconductivity by the Pr ions in the La sites.
關鍵字Superconductivity;Cell parameters;Hole concentration;Oxygen stoichiometry
語言英文
ISSN0921-4534
期刊性質國外
收錄於SCI
產學合作
通訊作者Kao, H. C. I
審稿制度
國別荷蘭
公開徵稿
出版型式紙本
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