| 研究生: |
王柏勛 Wang, Po-Hsun |
|---|---|
| 論文名稱: |
核磁共振研究比較XAl4(X=Sr,Ba)電子特性 Comparative NMR study of local electronic properties of XAl4 (X=Sr,Ba) intermetallics |
| 指導教授: |
呂欽山
Lue, Chin-Shan |
| 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: | 2011 |
| 畢業學年度: | 99 |
| 語文別: | 中文 |
| 論文頁數: | 43 |
| 中文關鍵詞: | 奈特位移 、態密度 、電子 、結構 、四重極效應 、自旋晶格鬆弛時間 、費米面 、核磁共振 |
| 外文關鍵詞: | Knight shift, density of state, electron, structure, Quadrupole effect, spin-lattice relaxation time, Fermi surface, NMR |
| 相關次數: | 點閱:88 下載:1 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
本篇論文是以核磁共振(NMR)的技術來量測SrAl4和BaAl4。從SrAl4和BaAl4 樣品的27Al的NMR頻譜中,來討論各個樣品的四重極效應、奈特位移及自旋晶格鬆弛時間。
利用NMR的自旋晶格鬆弛時間T1來研究得到SrAl4和BaAl4在費米能階上的態密度主要是由Al-3p電子的貢獻,而由費米面上態密度可進一步得知BaAl4穩定性較SrAl4高。
We have performed a systematic study of SrAl4 and BaAl4 using NMR spectroscopy.The quadrupole splitting ,the Knight shift(K) ,as well as the spin-lattice relaxation rate (1/T1) of each individual compound have been identifiend.
According to 27Al spin-lattice relaxation rate (1/T1) ,the Al p-electron are the main source for the T1 of SrAl4 and BaAl4. From Fermi-level density of states (DOS) ,we confirms that BaAl4 is more stable than SrAl4 with respect to BaAl4-type structure.
(1)R. Pöttgen and D. Johrendt, J. Chem. Sci. 63, 1135 (2008)
(2)W. B. Zhang, X. B. Xiao, W. Y. Yu, N. Wang, and B.Y. Tang , Phys.Rev. B 77, 214513 (2008)
(3)Marianne Martin geb. Rotter aus Fort Sill (USA) 2010
(4)Chong Zheng and Roald Hoffmann , Z. Naturforsch.41b , 292-320 (1986)
(5)Makhmudov, M M;Bodak, O I;Vakhobov, A V;Dzhuraev, T D;
Russ. Metall , no. 6, pp. 209-212. (1981)
(6)G. Bruzzone and F. Merlo , Journal of the Less Common Metals,Volume 39, Issue 1, January 1975, Pages 1-6.
(7)W. H. Jones, Jr., T. P. Graham, and R. G. Barnes, Phys. Rev. 132, 1898(1963)
(8)C. S. Lue, W. J. Lai, Phys. stat. sol. (b) 242, 1108 (2005).
(9)G. C. Carter, I. D. Weisman, L. H. Bennett, and R. E. Watson, Phys. Rev. B 5, 3621(1972).
(10)S. Yu. Savrasov, D. Yu. Savrasov, Phys. Rev. B 46 (1992)
(11)W. D. Knight, Nuclear Magnetic Resonance Shift in Metals, Phys. Rev. 76, 1259 (1949)
(12)C. L. Fu, X. Wang, Y. Y. Ye, and K. M. Ho,Intermetallics 7,179 (1999)