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| 研究生： |
張志豪 Chih-Hao Chang |
|---|---|
| 論文名稱： |
雜摻鐠與鑭之鐠-鋇-銅氧化合物對結構與磁性的研究與探討 |
| 指導教授： |
李文献
Wen-Hsien Li |
| 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 |
| 畢業學年度： | 88 |
| 語文別： | 中文 |
| 論文頁數： | 77 |
| 中文關鍵詞： | 鐠-鋇-銅氧化合物 、中子 、長方結構 、四方結構 、反鐵磁性 |
| 外文關鍵詞： | PrBa2Cu3O7+y, neutron, orthorhombic, tetragonal, antiferromagnetic |
| 相關次數： | 點閱：10 下載：0 |
| 分享至: |
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雜摻鐠原子的系統，當雜摻量為11%時，空間對稱群為Pmmm，當雜摻量為24%時，空間對稱群為P4/mmm，隨雜摻量增加，樣品的氧含量會增加，增加的氧會在CuO反鏈位置，結構上會由長方結構轉變為四方結構，其Pr(1)與CuO2層面上氧的平均距離亦會增加。雜摻鑭原子的系統，當雜摻量為9%與18%時，空間對稱群為Pmmm，當雜摻量為29%時，空間對稱群為P4/mmm，隨雜摻量增加，樣品的氧含量亦會增加，增加的氧也會在CuO層上，結構上會由長方結構轉變為四方結構，其Pr(1)與CuO2層面上氧的平均距離亦會增加。
利用交流磁化率對兩系統樣品進行一系列對低溫以及高溫相轉變來源研究的實驗。在鋇氧層雜摻鐠與鑭的系統，低溫相轉變可能都是由鐠離子的磁有序所造成，兩系統鐠的磁有序溫度皆有隨雜摻量增加而下降的趨勢，鐠離子含量增加使得其有效磁矩增加﹔對雜摻非磁性離子La的系統，其鐠離子的有效磁矩並未明顯的增加。利用中子磁繞射實驗深究其兩系統中鐠的磁結構，發現兩系統的磁結構相對原Pr123的磁結構並無明顯變化。
在鋇氧層雜摻鐠與鑭兩系統，對高溫的相轉變來源可能是由銅離子所造成的，約在275 K附近觀察到銅的磁有序現象，其磁有序溫度並不會隨著雜摻量增加而有所改變，銅的有效磁矩亦無明顯變化。
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