電荷密度波動態相變之X光繞射研究｜國立清華大學博碩士論文庫

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研究生：	葉姿蘭 Tzu-Lan Yeh
論文名稱：	電荷密度波動態相變之X光繞射研究 X-ray Diffraction Study of the Dynamic Phase Transition of Charge Density Wave
指導教授：	張石麟 Shih-Lin Chang
口試委員:
學位類別：	碩士 Master
系所名稱：	理學院 - 物理學系 Department of Physics
論文出版年：	2005
畢業學年度：	93
語文別：	英文
論文頁數：	56
中文關鍵詞：	電子密度波、相變、複繞射、三光相位
外文關鍵詞：	charge density wave, phase transition, multiple diffraction, triplet phase
相關次數：	點閱：3 下載：0
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本論文之目的為研究准一維系統－藍銅礦K0.3MoO3之電荷密度波在外加電場下的動態相變。利用三光複繞射的技術以及模擬晶格調變的程式，考慮Ｘ光繞射之動力效應的情況下，建立三光相位與晶格形變的關連。三光相位在不同外加電壓下的變化可以幫助我們更近一步了解電荷密度波之動態相變。實驗結果顯示此系統三光相位之明顯變化，反映了電荷密度波在外加電場下的動態相轉變。藉由電腦模擬我們也可以獲得電荷密度波相變下晶格調變的資訊。

By using x-ray scattering and multiple diffraction techniques, this study seeks to revisit the dynamic transition of charge density waves in K0.3MoO3, a quasi-one-dimensional charge-density-wave material, under applied voltage. The three-wave diffraction was performed to obtain information about the triplet phase and simulation of the modulation of underlying lattice was done. Together with consideration of dynamical theory of x-ray di□raction, this
established the connection between the lattice distortion and the triplet phase in x-ray diffraction and helped to understand the dynamical transition of charge density wave. The results showed clear evidences of dynamical phase transition of charge density wave under applied voltage and the corresponding atomic displacement was calculated.

List of Figures iii
List of Tables v
Introduction 1
X-ray Di□raction 3
1 Bragg Reflection . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Multiple-Wave Diffraction . . . . . . . . . . . . . . . . . . . . 6
3 Structure Factor Triplet . . . . . . . . . . . . . . . . . . . . . 8
4 Structure Factor for Modulated structure . . . . . . . . . . . . 10
Introduction to the Charge Density Wave 13
1 Charge-Density-Wave Ground State . . . . . . . . . . . . . . . 14
1.1 One Dimensional Electron Gas . . . . . . . . . . . . . 14
1.2 The Peierls Transition . . . . . . . . . . . . . . . . . . 15
2 Electronic Transport Property . . . . . . . . . . . . . . . . . . 18
3 The CDW Material - K0:3MoO3 . . . . . . . . . . . . . . . . . 20
Experimental 26
1 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2 Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Result and Analysis 32
1 Measurement of Transport Property . . . . . . . . . . . . . . . 32
2 X-ray Di□raction Measurement . . . . . . . . . . . . . . . . . 32
3 Triplet Phase Analysis . . . . . . . . . . . . . . . . . . . . . . 34
Conclusion 45
A Dynamical Theory of X-Ray Diffraction 47
A.1 Fundamental Equation of Wave field. . . . . . . . . . . . . . . 48
A.2 Boundary Conditions . . . . . . . . . . . . . . . . . . . . . . . 51

                                

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