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系統識別號 U0026-1207201311165600
論文名稱(中文) 利用交流磁化率方法研究超導奈米複合材料的物理性質
論文名稱(英文) AC susceptibility studies of superconducting nanocomposites
校院名稱 成功大學
系所名稱(中) 物理學系碩博士班
系所名稱(英) Department of Physics
學年度 101
學期 2
出版年 102
研究生(中文) 陳柏勳
研究生(英文) Bo-Xun Chen
學號 l26001105
學位類別 碩士
語文別 中文
論文頁數 138頁
口試委員 指導教授-張烈錚
口試委員-王立民
口試委員-吳忠霖
中文關鍵字 超導奈米複合材料  交流磁化率  渦漩  活化能 
英文關鍵字 superconducting nanocomposites  AC susceptibility  vortex  activation energy 
學科別分類
中文摘要 本論文利用量測交流磁磁化率的方法,來探討超導奈米複合材料。本實驗中的奈米複合材料是將第一類超導金屬汞、錫和銦,嵌入蛋白石(opal)中,而內部的超導金屬形成三維的網狀結構。在這系統中,樣本將會存在第二類超導體的特性,然而我們改變其交流磁場的振幅與頻率在不同的直流磁場下,可以了解其樣本的渦漩(vortices)行為和得到H-T相圖。
然而在這三種奈米複合材料中,我們觀察到H-T相圖中Hc2(T)的曲率由正曲率轉變為負曲率。然而利用交流磁化率虛部的量^"對於不同的交流場頻率下而產生的現象來計算其活化能(activation energy),觀察到隨著外加直流磁場的增加,在約Hco(crossover magnetic field)時其活化能迅速的減少,所對應是Hc2(T)的曲率在H-T相圖中的轉變。
然而這樣的現象告訴了我們渦漩態(vortices)分布隨著直流磁場的增加將變得更加的均勻。而在這三維的反蛋白石結構將造成其Hco約為樣本上臨界磁場(upper critical field)的一半。
英文摘要 In this thesis, we report detailed studies of superconductivity in opal nanocomposites by ac magnetization. Three different type I superconducting metals (indium, tin and mercury) were embedded into the same template—artificial opal with a well-ordered three-dimensional porous network. We observed that the nanostructured type I superconductors exhibited properties of type II superconductor which were strongly influenced by vortex motion.
Results of amplitude dependences of ac susceptibility manifested a H_ac∝〖(1-T_p/T_c )〗^(3/2) dependence which suggested that the nanostructured type I superconductors were a strongly-linked superconducting array. A pronounced curvature crossover of the upper critical field lines with a crossover field Hco in the H-T phase diagrams for all these nanostructured type I superconducting metals was observed. The field dependences of activation barrier in these nanocomposites also showed a crossover at Hco which suggest a vortex phase transition caused by a redistribution of vortices. The crossover field Hco is approximately equal to one-half upper critical field (1/2Hc2 (0)).
論文目次 目錄
摘要…………1
ABSTRACT…………2
致謝…………3
目錄…………4
圖目…………6
表目…………15
第一章簡介
1.1簡介…………………………16
1.2樣品系統與製備……………19
第二章 實驗儀器與方法
2.1交流磁化率理論…………22
2.2物理特性量測系統簡介……………24
2.3交流磁化率量測套件簡介…………26
2.4量測方法及樣品準備………32
第三章 超導概論與背景理論
3.1第一類超導體…………………35
3.2第二類超導體…………………37
3.3背景理論與概念……………39
3.4熱激發磁通擩動與活化能.......43
第四章 實驗結果與分析
4.1汞的奈米複合材料量測
4.1.1變振幅的交流磁化率量測結果………46
4.1.2變頻率和變直流磁場的交流磁化率量測結果……………49
4.2錫的奈米複合材料量測
4.2.1變振幅的交流磁化率量測結果………74
4.2.2變頻率和變直流磁場的交流磁化率量測結果……………77
4.3銦的奈米複合材料量測
4.3.1變振幅的交流磁化率量測結果………97
4.3.2變頻率和變直流磁場的交流磁化率量測結果…………………100
4.4實驗結果分析與討論……………125
第五章 結論………………………………131
參考文獻………………………………133
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