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題名 | Ion Substitution Effects on the Structure Stability of Cuprate Superconductors |
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作者姓名(外文) | Wu,M. K.; Chen,D. H.; Chen,D. Y.; Sheen,S. R.; Chien,F. Z.; | 書刊名 | 淡江理工學刊 |
卷期 | 3:3 2000.11[民89.11] |
頁次 | 頁139-144 |
分類號 | 440.35 |
關鍵詞 | 超導性; 晶格參數; 鈣鈦礦; Superconductivity; Lattice parameters; Perovskite; Tolerance factor; |
語文 | 英文(English) |
英文摘要 | We have demonstrated that using a transition metal ion to partially substitute Cu ion of the YSr2Cu3Oy can stabilize its crystal structure and retain superconductivity. The superconducting transition temperature in YSr2(Cu1-xMx)3Oy, where M is transition metal ion, ranges from 40K to 80K depending on the specific M ion. Lattice contrition due to Sr substitution makes the Ba/Sr ion to move closer to CuO plane, and consequently leads to a charge transfer between oxygen. Our study shows that the key factor controlling the structural stability in Y-Sr-Cu-O system is the effective ionic radius Sri un lattice. The introduction of transition metal doping is to increase the effective ionic radius of Sr through the increase of oxygen content. |
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