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研究生:雷棋雄
論文名稱:La2-xSrxCu1-yZnyO4(x∼0.21)的加Zn效應:X光吸收光譜學測量
論文名稱(外文):The Effect of Zn on La2-xSrxCu1-yZnyO4 (x~0.21):X-ray absorption spectral measurement
指導教授:張秋男張秋男引用關係
學位類別:碩士
校院名稱:國立臺灣師範大學
系所名稱:物理研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:59
中文關鍵詞:超導體吸收光譜
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本論文研究的目的在探討Zn的摻雜對La2-xSrxCuO4樣品的晶體結構以及電子結構的影響。 我們利用同步輻射測量各樣品的 O 1s及Cu LⅡ,Ⅲ 的吸收光譜研究它們在Fermi energy附近的電子結構變化。
La2-xSrxCu1-yZnyO4是摻雜Zn2+離子取代Cu2+離子。從X-ray粉末繞射結果可知La2-xSrxCu1-yZnyO4是四方晶格結構,隨著x的增加a軸有逐漸變小、c軸有逐漸增加的趨勢,而Zn的摻雜對a、c軸的影響在誤差範圍內無法看出具體的效應。當材料未摻雜Zn時(y=0),在超摻雜(overdopping)區域是隨著Sr取代量的增加,超導臨界溫度是逐漸下降的,從吸收光譜可發現Ia(528.4 eV;表示電洞濃度的貢獻)有逐漸增強的趨勢,顯示出隨著Sr2+摻雜費米面附近的電洞態有增加的趨勢。另外當樣品加入1%的Zn取代銅時,從SQUID測得的Tc有明顯的抑制下降效應,而從吸收光譜的量測結果顯示,在實驗誤差範圍內Zn的摻雜並沒造成價電帶強度的改變,顯示出Zn對超導的抑制來源並非來自於電子結構的改變。

The purpose of this study is to investigate the effects of Zn on the lattice and electronic structures of La2-xSrxCuO4.
Series of samples of La2-xSrxCu1-yZnyO4 (0.17≦x≦0.30, y=0.01) are prepared by chemical solid reaction. The results of X-ray diffraction(XRD) show that all samples are tetragonal. Lattice constant a is found to decrease with the increase of x while the change of c is in the opposite. No effect of Zn on a and c found within the experimental accuracy.
Synchrontron radiation is used to obtain the absorption spectra of O1s and Cu LⅡ,Ⅲ for each sample. It is found in O1s pre-edge peak that Ia (528.4 eV, transition to the hole state in the valence band) is gradually enhanced. It shows that the hole states near the Fermi level in the valence band increases with the concentration of Sr2+.
When Cu2+ is substituted by 1% Zn2+ , the Tc , as derived from the magnetization curve by using a SQUID(Superconducting Quantum Interference Device) decrease. However, from one to one comparision between the samples with and without Zn doping, no esssential change of the O1s pre-edge peak is observed within the statistical errors. We conclude that the substitution of Zn for Cu does not affect the electronic structure of the sample and thus the drop of Tc does not result from the electronic structure.

第一章 前言……………………………………………………………1
第二章 簡介與動機
La2-xSrxCuO4材料性質研究的介紹……………………….….3
第三章 樣品製作…………………………………………………...….8
第四章 材料品質測定
4-1 X光晶體繞射
(A) 儀器與原理………………………….……………….…..10
(B) 樣品相分析………………………….…………………...11
(C) 樣品晶格常數分析………………….…………………...15
4-2 SQUID……………………………………………………….18
第五章 X光近緣吸收光譜
5-1 吸收光譜…………………………………………………….20
5-2 三能帶(three-band)Hubbard模型…………………………...22
5-3 吸收光譜測量方法…………...……………………………..23
5-4 同步輻射光源………..………………….…………………..24
5-5 HSGM光束線…………..……………….………………….24
5-6 吸收譜實驗儀器裝置……………………………………….27
5-7 實驗數據的分析方法…………………….…………………29
第六章 吸收光譜實驗結果
6-1 O1s近緣吸收光譜…………………………………….……30
6-2 Cu LⅡ,Ⅲ 近緣吸收光譜...……………………….…….….…39
第七章 結論與討論………………………………………….……….42
第八章 附錄---紅外光譜
8-1 紅外光譜簡介…………………………………………….....44
8-2 紅外光譜儀器與實驗……………………………………….45
8-3 紅外光譜數據分析……………………………………….…50
8-4 紅外光譜實驗結果與討論……………………………….…53
參考資料…………………………………………………………….….58

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