教師資料查詢 | 類別: 期刊論文 | 教師: 張經霖 CHANG, HENRY CHING-LIN (瀏覽個人網頁)

標題:Effects of Ca-doping on local structure in RBa2Cu3O7-δ systems (R=Y, Gd and Nd)
學年
學期
出版(發表)日期2001/03/01
作品名稱Effects of Ca-doping on local structure in RBa2Cu3O7-δ systems (R=Y, Gd and Nd)
作品名稱(其他語言)
著者張經霖; Chang, C. L.; Dong, C. L.; Liu, S. Y.
單位淡江大學物理學系
出版者Amsterdam: Elsevier BV
著錄名稱、卷期、頁數Journal of Electron Spectroscopy and Related Phenomena 114-116, pp.689-692
摘要Ca-doping generates excessive holes and suppresses the superconducting transition temperature Tc of RBa2Cu3O7−δ (R123) due to the over doping effect. Relatively, the normal state resistivity of R123 systems dependent on the ion size of rare earth (R). Both Ca-doping and rare earth replacement cause structural modification on the CuO2 plane. In order to study the effects on local structure around CuO2 plane due to Ca-doping and rare earth ion size in R123 system, we have performed extended X-ray absorption fine structure (EXAFS) measurements on two series of R1−xCaxBa2Cu3O7−δ samples (for RGd, x=0, 0.1 and 0.2; for x=0.1, RY, Gd and Nd) at room temperature. Our results show that in the Gd system the Cu–O bond distance and the static disorder, as indicated by Debye–Waller factor, increases with Ca concentration. For samples with different rare earths but the same Ca content (x=0.1), we found the static oxygen disorder of the surrounding atoms increases with the radius of the R3+ ion. No significant changes in the coordination number of O surrounding Cu were observed. We conclude that the decrease of superconducting temperature due to Ca-doping and the increase of the normal state resistivity with R3+ ion size are both related to the increased static oxygen disorder in the lattice.
關鍵字High temperature superconductor; EXAFS; Ca-doping; Lattice disorder
語言英文
ISSN0368-2048
期刊性質國外
收錄於
產學合作
通訊作者
審稿制度
國別荷蘭
公開徵稿
出版型式紙本
相關連結
SDGs
Google+ 推薦功能,讓全世界都能看到您的推薦!