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研究生:方宏誠
研究生(外文):Hung-Cheng Fang
論文名稱:觀察絕緣態Al-Pd-Re準晶中由Mott跳躍傳導轉變到Efors-Shklovskii跳躍傳導的現象
論文名稱(外文):A cross over from Mott hopping conduction to Efors-Shklovskii hopping conduction in insulating Al-Pd-Re quasicrystals
指導教授:林水田林水田引用關係
指導教授(外文):Shui-Tien Lin
學位類別:碩士
校院名稱:國立成功大學
系所名稱:物理學系碩博士班
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:49
中文關鍵詞:準晶
外文關鍵詞:Efors-ShklovskiihoppingquasicrystalMottAL-Pd-Re
相關次數:
  • 被引用被引用:1
  • 點閱點閱:183
  • 評分評分:
  • 下載下載:14
  • 收藏至我的研究室書目清單書目收藏:0
結合"軌域負磁阻理論(forward interference)"與"正
磁阻波函數收縮理論(wave function shrinkage)",我們
可以將高電阻比絕緣態的Al-Pd-Re準晶在液氦溫度磁阻數
據擬合的很好。我們並發現:(1)絕緣態的Al-Pd-Re準晶其電阻比r=ρ(4.2K)/ρ(300K)由81至129以上在液氦溫度(1.5K∼4.2K)會由Mott的可變程跳躍(VRH)傳導變
成Efors and Shklovskii VRH傳導;(2)傳導轉變的溫
度過渡區,隨著電阻比變大而變小,但傳導的轉變溫度隨電阻比增加而昇高,且兩者呈線性關係。
We are able to explain well the Magnetoresistance of Al-Pd-Re
quasicrystals(QCs) at helium temperature by means of the forward interference and the wave-function shrinkage theories. We also found : (1)there is a cross over from Mott VRH conduction to ES VRH conduction at liquid helium temperature in the Al70Pd22.5Re7.5 QCs with a resistivity ratio
r=ρ(4.2K)/ρ(300K) ranging from 81 to 129 ; (2) the range of the cross over regime decreases with increasing the sample’s r value and the cross over temperatures are linearly dependent on the sample’s r values.
摘要 1
誌謝 3
目錄 4
表目錄 5
圖目錄 6
第一章 簡介 9
第二章 實驗儀器與步驟 11
2-1 樣品的製作 11
2-2 準晶電阻與磁阻的量測系 11
2-3 量測磁阻方法 12
第三章 理論 14
3-1 軌域負磁阻理論(orbital magnetoconductivity theory
or forward innterference theory) 14
3-2 正磁阻-波函數收縮理論(wave function shrinkage
theory) 16
第四章 結果與討論 20
4-1 討論 20
4-1-1 零磁場電導 20
4-1-2 磁阻與磁阻分析 24
4-2 結論 42
參考資料 47
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