自從發現以鑭系為基礎的銅氧化物(La2-xSrxCuO4)在x~ 時產生特殊現象，使得近年來對於stripe phase的研究風氣大開，相關的諸多實驗如中子繞射、拉曼與遠紅外光光譜、霍爾效應與磁化率等等都有詳細的報導。這些研究結果均顯示出銅氧面上一維與二維間在x~ 處發生電荷轉移。
在本篇論文中我們利用固態反應法合成了La2-xSrxCu0.995Zn0.005O4系列的p型超導體，大家都知道La2-xSrxCuO4系列樣品的Tc – x相圖中x~ 的地方會出現明顯的drop，而這個現象有可能與stripe phase有關。
先前，本實驗室已做過La2-xSrxCuO4與La2-x-ySrxNdyCuO4此二系列之X光吸收近邊緣結構光譜的研究，其研究結果指出吸收光譜曲線在upper Hubbard Band (UHB)能帶的能量區間上，兩者有明顯的差異，而導致此差異的原因是stripe，且只在La2-x-ySrxNdyCuO4系列中觀察到，在La2-xSrxCuO4系列並沒有觀察到。Stripe在La2-xSrxCuO4系列沒有觀察到的原因可能是在Tc – x相圖中x~ 處之drop較La2-x-ySrxNdyCuO4系列小。本篇論文即討論比La2-xSrxCuO4系列具有較明顯drop的La2-xSrxCu0.995Zn0.005O4系列，其光譜圖與La2-x-ySrxNdyCuO4系列的比較，以及stripe phase在熱電力上的影響。

Since discovering the anomaly of the La-based cuprates (La2-xSrxCuO4) at x~ , researches of stripe phase have been prevailing recently. Related vast experiments, like neutron scattering, Raman and infrared ray (IR) spectra, Hall effect, and magnetic susceptibility etc. have performed on this subject. These results indicate that a crossover from one- to two-dimensional charge transport happens at x~ .
In this thesis, we synthesize p-type superconductors La2-xSrxCu0.995Zn0.005O4 by solid-state reaction. It has been well know there is a marked drop in Tc- x phase diagram at x~ of La2-xSrxCuO4. It is possible that this phenomenon is related to the formation of a stripe phase.
The experimental work on x-ray absorption near edge spectroscopy (XANES) in La2-xSrxCuO4 and La2-x-ySrxNdyCuO4 have been done during these years in our laboratory. The results show that the absorption-spectroscopy diagrams of two systems have apparent differences in the region of upper Hubbard Band (UHB). The differences are due to that the stripe is observed in La2-x-ySrxNdyCuO4, but not in La2-xSrxCuO4. No observation of stripe phase in La2-xSrxCuO4 may be attributed to that the drop at x~ in Tc-x phase diagram of La2-xSrxCuO4 is smaller than that in La2-x-ySrxNdyCuO4. Therefore, thesis reports the comparison of spectroscopic diagram between La2-x-ySrxNdyCuO4 and La2-xSrxCu0.995Zn0.005O4, which show more a pronounced Tc-x drop than the La2-xSrxCuO4 system. Meanwhile, the effect on the thermoelectric power by the formation of stripe phase is also investigated and discussed as well.

目 錄
page
圖目錄
表目錄
第一章 簡介………………………………………………….….1
第二章 基本理論……………………………………………......8
第一節 超導體的基本特性……………………….............8
第二節 超導體的微觀理論…………………………….…9
第三節 Stripe phase簡介…………………………………14
第四節 熱電效應的基本原理…………………………….17
第三章 基本實驗步驟…………………………………………...19
第一節 樣品的製程……………………………………….19
第二節 結構檢測(X-ray)…………………………………..20
第三節 電性測量…………………………………………..22
第四節 熱電力測量………………………………………..25
第四章 X光吸收近邊緣結構光譜………………………………. 28
第一節 X光吸收光譜實驗的概念………………………..28
第二節 同步輻射實驗設備簡介…………………………..31
第三節 X光吸收近邊緣結構光譜的實驗流程…………34
第四節 X光吸收近邊緣結構光譜的自我吸收校正……36
第五章 量測結果的分析與討論……………………..…………41
第一節 樣品的結構分析與討論…………………………41
第二節 樣品的電性分析與討論…………………………44
第三節 樣品的熱電力分析與討論………………………47
第四節 X光吸收近邊緣結構光譜的自我吸收效應分析
與討論………………………………………….…51
第六章 結論…………………………………………………….. 63
參考文獻…………………………………………………………….66

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