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研究生： 胡家瑋
Hu, Chia-Wei
論文名稱： 準一維LiCu2O2單晶之銅K吸收邊共振非彈性X光散射光譜研究
Resonant inelastic X-ray scattering study of quasi-one-dimensional cuprate LiCu2O2 at Cu K-edge
指導教授： 林滄浪
Lin, Tsang-Lang
崔古鼎
Tsuei, Ku-Ding
口試委員:
學位類別： 碩士
Master
系所名稱： 原子科學院 - 工程與系統科學系
Department of Engineering and System Science
論文出版年： 2009
畢業學年度： 97
語文別： 英文
論文頁數： 107
中文關鍵詞： 共振非彈性X光散射 、銅氧化合物 、高溫超導材料 、X光吸收光譜 、電荷轉移躍遷
外文關鍵詞： resonant inelastic x-ray scattering, RIXS, X-ray absorption, charge transfer excitation, cuprate
相關次數： 點閱：4  下載：0 
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    • LiCu2O2是強關聯電子系統的銅氧化合物，其具有反鐵磁性、準一維銅氧鏈上的自旋螺旋現象以及多鐵性質；並且被認為是一個電荷躍遷機制的絕緣系統。所以LiCu2O2的電子結構是能了解其本身新奇電性與磁性機制的重要研究課題。在本論文中，我以銅K吸收邊X光吸收光譜與共振非彈性X光散射光譜研究LiCu2O2單晶的銅氧鍵結能態與方向性、以及費米能階附近的電荷躍遷電子動態行為。從偏極方向相依之X光吸收光譜可以知道具有一價銅4px,y特徵的吸收能量為8981.5電子伏特、二價銅4pπ特徵的吸收能量為8985電子伏特。另外，從光譜也可得知約在8988電子伏特的吸收能量有很強的z軸方向特徵、被認為是一價銅位置的4pz軌域的吸收。從共振非彈性X光散射光譜則可以發現3.6電子伏特和6.1電子伏特的能量損失，並對應至銅4pσ的吸收能量；而另一個4.9電子伏特的能量損失對應到一價銅4px,y吸收能量。本論文的研究結果發現一維銅(II)氧鏈狀結構之間的一價銅原子在電性上對整個系統扮演了一個重要的角色，而可能是LiCu2O2具有自旋螺旋現象的影響因素之一。而在共振非彈性散射光譜所觀察到的能量損失可以認定是電荷躍遷的機制，LiCu2O2的電荷躍遷能隙大約為3.6電子伏特。

    論文摘要 Abstract 誌謝詞 Contents List of tables List of figures 1 Introduction 2 Backgrounds 2.1 Electronic band structure 2.1.1 Hubbard model 2.1.2 Electronic structure of LiCu2O2 2.2 Sample preparation and properties 2.3 Synchrotron light source 3 Polarization dependence of Cu K-edge X-ray absorption 3.1 Introduction 3.2 Principle of the photo-absorption 3.3 Experiment and results 3.4 Discussions 3.4.1 Pre-edge channel 3.4.2 Orbital orientations 4 Resonant inelastic X-ray scattering at Cu K-edge 4.1 Introduction 4.2 Resonant inelastic X-ray scattering 4.2.1 Principle 4.2.2 The shake-up model 4.3 Incident photon energy dependence 4.4 Momentum transfer dependence 4.5 Discussions 4.5.1 Cu Kβ2,5 fluorescence of LiCu2O2 4.5.2 Energy loss feature – the shake-up model 4.5.3 Charge excitations in LiCu2O2 5 Conclusions References

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