English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 49378/84106 (59%)
造訪人次 : 7380252      線上人數 : 66
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/987654321/32505


    題名: 電荷密度波之軟X光共振散射研究
    其他題名: Resonant soft X-ray scattering of charge-density-wave study in chromium
    作者: 廖尹駿;Liao, Yin-jiun
    貢獻者: 淡江大學物理學系碩士班
    杜昭宏;Du, Chao-hung
    關鍵詞: 軟X光共振散射;電荷密度波相變;Resonant Soft X-ray Scattering;CDW
    日期: 2009
    上傳時間: 2010-01-11 02:15:07 (UTC+8)
    摘要: 在本論文中,我們利用軟X光的共振散射方法來研究純金屬鉻的電荷密度波相變。使用一般的X光會使接收到的散射訊號太弱而無法研究電荷密度波的重要細節,因此藉由L_2與L_3-edge的共振效應可以增強電荷密度波的散射訊號,幫助我們了解電荷密度波相變的性質與費米面附近的電子行為。純金屬鉻的電荷密度波調制波向量Q_CDW≈(0.09 0 0)。首先,我們將光源變換成水平與垂直兩種不同的極化方向來觀察電荷密度波隨能量的變化。之後將極化方向固定為水平方向並改變溫度觀察電荷密度波隨溫度的變化。最後我們量測布拉格繞射峰隨溫度的變化來研究自旋翻轉與晶格形變的關係。
    In this study, we have demonstrated that CDW modulation in Cr can be probed using soft x-ray scattering. Because of the very weak signal from the satellite reflections caused by the formation of CDWs, it is difficult to undertake the detailed studies of CDWs with non-resonant x-ray scattering. However, with the help of resonant x-ray scattering, diffraction signals from weak satellite reflections could be largely enhanced. The wavelength λCDW was observed to have ~10a (a:lattice parameter of Cr) and Q_CDW≈(0.09 0 0) along [100] direction, and we obtained resonant enhancement of the signal near L2 and L3 edges. We studied the CDW peak at both of π and σ channels at T=77K and the temperature dependence between 70K and 300K at π channel.We also studied the temperature dependence of the Bragg peak.
    顯示於類別:[物理學系暨研究所] 學位論文

    文件中的檔案:

    檔案 大小格式瀏覽次數
    0KbUnknown230檢視/開啟

    在機構典藏中所有的資料項目都受到原著作權保護.

    TAIR相關文章

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