本論文的主要目地是研究釔鋇銅氧薄膜(簡稱YBCO)中持久的光致電導現象的準粒子動力行為。本實驗大概可以分為兩部分，第一部分是利用電阻-溫度量測系統來確定其釔鋇銅氧薄膜會經照光產生持久的光致電導現象(the Persistent photoconductivity) ，第二部分是利用反射光的時間解析之量測系統來研究釔鋇銅氧薄膜中的載子動力行為，所使用的理論主要是雙溫模型(the two temperature model)和費米傾斜原理( Fermi-smearing )來解釋載子的動力行為。我們提出修正的模型來解釋為什麼載子濃度低的半導體結構之YBCO薄膜的載子動力行為不同於文獻上載子濃度高的半導體結構之YBCO薄膜的載子動力行為，我們也觀察到把缺氧樣品照光所產生的載子動力行為變化和直接把缺氧樣品補氧的效果類同。

The goal of my thesis is to study the quasiparticle dynamics in YBCO films with the persistent photoinduced conductance effect. Our experiment contains two parts. In the first part, we use the resistance-temperature measurement to make sure the generation of the persistent photoconductivity in YBCO films illuminated by photons frequency doubled by diode laser (wave length 532 nm). In the second part, we use the time-resolved reflectivity system to measure the transient behaviors of quasiparticle in YBCO films and use the two temperature model and the Fermi surface -smearing theory to explain their dynamics. Our experiment can discover the different particle dynamics of YBCO films with the generation of the persistence photoconductivity .We propose the correctional model to explain the difference of the quasiparticle dynamics between semiconducting YBCO films of lower carrier concentration in our experiment and that of high carrier concentration in literature .We also find that the transient behavior change of the oxygen deficient YBCO films illuminated by photons is similar to that increased oxygen.

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