English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 58286/91808 (63%)
造訪人次 : 13819937      線上人數 : 55
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27583

    題名: Transport properties and raman scattering studies of superconducting ferromagnet ru1-xAlxSr2GdCu2O8
    作者: 林大欽;Ling, D. C.;Yang, S. G.;Hsu, S. C.;Liu, H. L.
    貢獻者: 淡江大學物理學系
    日期: 2003-05-01
    上傳時間: 2009-12-31 10:27:20 (UTC+8)
    出版者: Springer
    摘要: Transport properties and Raman spectra of Ru1−x AlxSr2GdCu2O8 (Al-doped Ru-1212) with x=0, 0.05, 0.1 and 0.15 have been investigated. The superconducting transition temperature of the Al-doped Ru1212 increases with increasing Al content up to 10%, and then decreases with increasing Al content. The observed result seems to indicate that excess holes induced by Al doping could transfer from RuO2 plane to CuO2 plane through apical oxygen for 0<x<0.1. Whereas for x>0.1, the holes might be trapped or localized in the RuO2 plane due to a local disorder induced by Al doping. The temperature dependence of the critical field can be fitted as H c2(T)=34(1−T/Tc)4.8, suggesting that the vortex dynamics of Ru-1212 might be intrinsically different from that of the other high-T c cuprates. The largest magnetoresistance (MR) of the Al-doped Ru-1212 occurs around magnetic ordering temperature, indicating that the exchange interaction between the carriers in CuO2 planes and the spins in RuO2 planes dominates the magneto-transport properties of the Ru-1212 system. The peak position of the 150 cm−1 involving Cu vibration along the c-axis hardly changes as x increases. It reveals that Al doesn't occupy Cu site. A new Raman active mode around 550 cm−1 observed in the Al-doped compounds might be attributed to doping-induced A1g -like apical oxygen mode.
    關聯: Journal of low temperature physics 131(3-4), pp.659-664
    DOI: 10.1023/A:1022900714129
    顯示於類別:[物理學系暨研究所] 期刊論文


    檔案 描述 大小格式瀏覽次數



    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋