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dc.contributor.author廖祐廣en_US
dc.contributor.authorLiao, You-Guangen_US
dc.contributor.author吳光雄en_US
dc.contributor.authorWu, Kaung-Hsiungen_US
dc.date.accessioned2014-12-12T01:40:19Z-
dc.date.available2014-12-12T01:40:19Z-
dc.date.issued2009en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#GT079721543en_US
dc.identifier.urihttp://hdl.handle.net/11536/45027-
dc.description.abstract在本論文中,我們分別利用飛秒脈衝雷射,以及奈米秒脈衝雷射,以脈衝雷射濺鍍法濺鍍La0.7Ca0.3MnO3薄膜,並且藉由La0.7Ca0.3MnO3薄膜基本特性的量測,以及超快激發探測系統(optical pump-probe spectroscopy, OPOP),比較用飛秒脈衝雷射濺鍍La0.7Ca0.3MnO3薄膜,和用奈米秒脈衝雷射濺鍍La0.7Ca0.3MnO3薄膜,兩者之間的基本特性,以及超快動力學行為的差異。在超快激發檢測光譜當中,瞬時反射率的變化率ΔR/R,可觀察到弛緩時間在次皮秒至數個皮秒的快弛緩行為,以及弛緩時間在數十到數百個皮秒的慢遲緩行為。其中,慢弛緩行為所對應的物理機制為自旋¬-晶格(spin-lattice)的弛緩行為;而快弛緩行為,根據本實驗室之前的研究發現,對應的是極化子(polaron)的行為,也因此快弛緩行為的變化趨勢,與電阻率的變化趨勢相符合。在此論文中,我們會針對快弛緩行為做一系列的討論,以進一步確認快弛緩行為與極化子行為的關聯性。zh_TW
dc.description.abstractIn this work, we have explored a method to prepared La0.7Ca0.3MnO3 thin film by using ultrafast-pulsed laser of 5000 Hz. We have prepared La0.7Ca0.3MnO3 thin film via two different methods: one is nanosecond-pulsed laser deposition, the other one is ultrafast-pulsed laser deposition. We compare the two resultant samples to see what factors differs the consequence. We also use optical pump-probe system(OPOP) to measure the ultrafast dynamics of the two samples produced through nanosecond-pulsed laser deposition and ultrafast-pulsed laser deposition. We deliberately discuss the two sample’s fast component behavior and slow component behavior, which respectively corresponds to polaron and spin-lattice thermalization, to see what difference exists in the La0.7Ca0.3MnO3 thin film prepared via ultrafast-pulsed laser deposition, and investigate what might cause the difference. In the end, we conclude our work with some way we can use to improve ultrafast-pulsed laser deposition.en_US
dc.language.isozh_TWen_US
dc.subject鑭鈣錳氧zh_TW
dc.subject超快雷射鍍膜zh_TW
dc.subjectLCMOen_US
dc.subjectFemtosecond-pulsed laser depositionen_US
dc.title以飛秒脈衝雷射製備La0.7Ca0.3MnO3薄膜及其超快動力學行為之研究zh_TW
dc.titleThe Study of Ultrafast Dynamics of La0.7Ca0.3MnO3 Thin Film Prepared by Femtosecond Pulsed Laser Depositionen_US
dc.typeThesisen_US
dc.contributor.department電子物理系所zh_TW
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