English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 57042/90725 (63%)
造访人次 : 12451415      在线人数 : 107
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/32563


    题名: 固態之聲子與電聲子計算 : 密度泛函微擾理論之研究
    其它题名: Phonon and electron-phonon coupling calculations in solids : density-functional perturbation theory study
    作者: 李世綸;Lee, Shih-lun
    贡献者: 淡江大學物理學系碩士班
    薛宏中;Hsueh, Hung-chung
    关键词: 聲子;超導相變溫度;密度泛函微擾論;phonon;electron-phonon coupling;linear response
    日期: 2006
    上传时间: 2010-01-11 02:21:33 (UTC+8)
    摘要: 元素Te,Se,Zr隨著壓力的變化具有豐富的結構相變及超導性質,利用密度泛函理論與密度泛函擾理論,研究其電子結構與晶格振動質,由於超導相變溫度和電子與聲子交互作用有關,所以利用Migdal-Eliashberg理論探討元素Te,Se,Zr在立方晶體(bcc)結構相之超導性質,發現隨著壓力的減少,超導相變溫度上升,與實驗結果一致,其超導相變溫度上變的原因,來自於聲子軟化(Phonon softening)。本論文除了電聲子耦合計算外,亦對微波材料BaMg1/3(Ta/Nb2/3O3,利用密度泛函微擾理論,計算其計算其Gamma點的聲子與振動模式,分析Raman實驗與FTIR實驗。
    The elements Te, Se, Zr have rich structural phase transitions and superconductive properties under pressure. With density functional theory and linear response scheme, we study electronic structures and vibrational properties, respectively. Since superconducting critical temperature Tc relates to electron-phonon coupling, so we study the
    superconductivity of Bcc Te, Se, Zr within Migdal-Eliashberg theory. The calculated superconducting critical temperatures under compression are in good agreement with experiment results, and Tc increases with decreasing pressure, which mainly attributed to the phonon softening. In this thesis, we also study the phonon and vibrational normal modes at Gamma point on microwave material BaMg1/3(Ta/Nb)2/3O3, and assign the corresponding normal modes in Raman and FTIR experiments.
    显示于类别:[物理學系暨研究所] 學位論文

    文件中的档案:

    档案 大小格式浏览次数
    0KbUnknown263检视/开启

    在機構典藏中所有的数据项都受到原著作权保护.

    TAIR相关文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回馈