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| 研究生： |
曾至國 Tseng, Chih-Kuo |
|---|---|
| 論文名稱： |
參雜Ru、Fe、Mn的Al70Pd22.5Re7.5絕緣態準晶之跳躍傳導現象 Hopping transport in insulating Al70Pd22.5Re7.5 quasicrystal doped with Ru、Fe、Mn elements |
| 指導教授： |
林水田
Lin, Shui-Tien |
| 學位類別： |
碩士 Master |
| 系所名稱： |
理學院 - 物理學系 Department of Physics |
| 論文出版年： | 2003 |
| 畢業學年度： | 91 |
| 語文別： | 中文 |
| 論文頁數： | 43 |
| 中文關鍵詞： | 跳躍傳導 、準晶 |
| 外文關鍵詞： | ES hopping VRH, Mott hopping VRH, quasicrystal |
| 相關次數： | 點閱：48 下載：1 |
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絕緣態的Al70Pd22.5Re7.5準晶其磁阻（Magnetoresistance：MR）行為可由軌域負磁阻理論（Forward interference theory）及正磁阻波函數收縮理論（Wave function shrinkage theory）解釋的很好，且在電阻比（Â=ρ(4.2K)/ρ(300K)） 77時，會由Mott可變程跳躍（Variable-range hopping：VRH）傳導轉變成Efors-Shklovskii（ES）VRH傳導，我們發現當Al70Pd22.5Re7.5分別參雜了Ru、Fe、Mn元素後，因庫倫能隙變大的關係，使得可變程跳躍傳導的轉變會提早發生。
The magnetoresistance(MR) of insulating Al70Pd22.5Re7.5 quasicrystals (QCs) can be explained well by the forward interference theory and the wave-function shrinkage theories, and there is a crossover from Mott VRH conduction to Efros-Shklovskii(ES) VRH conduction at liquid helium temperature in the Al70Pd22.5Re7.5 QCs with a resistivity ratio Â= 77. We found that when Al70Pd22.5Re7.5 QCs are doped with Ru or Fe or Mn elements, the crossover can occur in the samples with a value of  around 50 because the Coulomb gap is widened greatly.
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