標題: | 以飛秒光譜研究(001)Y0.7Ca0.3Ba2Cu3O7-δ薄膜之超快動力學 Ultrafast Dynamics in (001) Y0.7Ca0.3Ba2Cu3O7-δ Thin Films Probed by |
作者: | 黃德江 Huang Te-Chiang 吳光雄 Kaung-Hsiung Wu 電子物理系所 |
關鍵字: | 超導;superconductor |
公開日期: | 2006 |
摘要: | 在本論文中,我們利用本實驗室自行發展的極化飛秒激發探測光譜系統技術,來研究(001)Y0.7Ca0.3Ba2Cu3O7-δ薄膜的超快動力學。此薄膜是利用脈衝雷射蒸鍍法製備,並且利用X-ray繞射儀、溫度-電阻四點量測方法來分析確認薄膜的晶體結構和傳輸特性。另外,藉由實驗室的控氧技術,改變不同的載子濃度,從過度摻雜到缺乏摻雜得到不同的臨界溫度,並且量測在不同溫度下,薄膜的瞬時反射率隨著溫度的變化,觀察釔鈣(0.3)鋇銅氧(001)軸向的弛緩行為。 In this thesis, a femtosecond spectroscopy pump-probe system has been used to study the ultrafast dynamics of (001) Y0.7Ca0.3Ba2Cu3O7-δ thin films. The Y0.7Ca0.3Ba2Cu3O7-δ thin films were prepared by pulsed laser deposition (PLD) and their characterizations were examined by x-ray diffraction and a four-probe measurement. The hole doping concentration of the sample was varied from over-doping to under-doping ranges by an oxygen control technique. The changes of transient- reflectivity ( ) were measured by a femtosecond pump-probe system. The relaxation dynamics of photoexcited quasiparticles and the average gap information in ab plane as a function of hole doping concentration were investigated systematically. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT009421537 http://hdl.handle.net/11536/81262 |
顯示於類別: | 畢業論文 |