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系統識別號 U0026-2106201312440300
論文名稱(中文) 93Nb核磁共振量測Nb4MSi(M=Fe,Co,Ni)的電子結構特性
論文名稱(英文) 93Nb NMR probe of the electronic properties of Nb4MSi(M=Fe,Co,Ni)
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) 李家綾
研究生(英文) Chia-Ling Li
學號 L26004030
學位類別 碩士
語文別 中文
論文頁數 49頁
口試委員 指導教授-呂欽山
口試委員-張烈錚
口試委員-朱明文
中文關鍵字 核磁共振  超導特性 
英文關鍵字 NMR  superconductivity 
學科別分類
中文摘要 低維度金屬鏈狀排列結構的化合物具有超導性質與CDW (charge-density-wave) 轉換共存的現象等物理特性,而這些特性中,在最近這幾年引起注意的是由電子-聲子交互作用耦合所產生超導特性。
屬於準一維Nb結構系統的Nb3Ch4(Ch = S, Se, and Te),其超導特性在先前已被研究過了。然而,以Nb原子為基元的準二維結構化合物至今仍未有進一步的相關研究,因此,準二維Nb結構化合物的研究對於了解低維度系統的超導特性是有其必要性的。對此計劃而言,由準二維Nb 網狀系統所組成的Nb4MSi (M = Ni, Co, and Fe),是相當適合的研究對象。
在本篇論文裡,將利用核磁共振(NMR)的技術來量測並探討同是屬於CuAl2 結構的Nb4FeSi、Nb4CoSi和Nb4NiSi 的電子特性。藉由量測93Nb的NMR 頻譜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。
英文摘要 Compounds with a low-dimensional metallic chain exhibit to several physical properties, including superconductivity and charge density wave(CDW) formation. Among these properties, the superconductivity under a weak coupling regime of electron–phonon interactions has attracted attention in the last several years. The superconductivity of these compounds has previously been reported for Nb3Ch4 (Ch = S, Se, and Te) with a quasi-1D Nb topology. However, Nb-based compounds with a quasi-2D have not been studied. Thus, the research on a quasi-2D Nb network is necessary to understand the superconductivity in this low-dimensional system. Nb4MSi (M = Ni, Co, and Fe) is a suitable model for this purpose because its crystal configuration is composed of a quasi-2D Nb network.
In this thesis﹐we have performed a systematic study of the CuAl2-type compounds Nb4FeSi、Nb4CoSi, and Nb4NiSi using 93Nb NMR spectroscopy. The quadrupole splitting, the Knight shift(K), as well as the spin-lattice relaxation time(T1) of each individual compound have been identified.
論文目次 摘要..............................................I
Abstract.........................................II
致謝............................................III
目錄.............................................IV
表目錄...........................................VI
圖目錄..........................................VII
第一章 前言......................................1
第二章 核磁共振基本原理
2-1 黎曼效應....................................3
2-2 線形........................................4
2-3 奈特位移.....................................6
2-4 四重極效應...................................9
2-5 運動方程式..................................11
2-6 自旋-晶格鬆弛時間..........................14
第三章 樣品製備
3-1 實驗儀器...................................17
3-2 樣品製作...................................18
第四章 實驗方法
4-1 核磁共振儀.................................19
4-2 NMR量測方法.................................22
第五章 實驗結果與討論
5-1 X-ray結果..................................27
5-2 磁性量測...................................29
5-3 線形與四重極效應...........................32
5-4 奈特位移...................................34
5-5 自旋晶格鬆弛時間與費米能階態密度...........36
第六章 結論.....................................46
參考文獻.........................................47
參考文獻 (1) R.N.Shelton, L.S.Hausermann-Berg, P.Klavins,H.D.Yang, M.Anderson, and C.A.Swenson, Phys.Rev.B 34, 4590 (1986)
(2) Y.K.Kuo, C.S.Lue, F.H.Hsu, H.H.Li, and H.D.Yang, Phys.Rev.B 64, 125124 (2001)
(3) Gihun Ryu, Sung Wng Kim, Satoru Matsuishi, Hitoshi Kawaji, and Hideo Hosono, Phys.Rev.B 84, 224518 (2011)
(4) E.I.Gladyshevski, Y.B.Kuzma, Z.Strukt.Khim. 6, 60 (1963)
(5) Y.Grin, F.R.Waner, M.Armbruster, M.Kohout,
A.Leithe-Jasper, U.Schwarz, U.Wedig, and H.Georg von Schering, J.Solid State Chem.179, 1707 (2006)
(6) Charles Kittel, Introduction to Solid State Physics 7th (1996)
(7) G.C.Cater, L.H.Bennett, and D.J.Kahan, Metallic Shift in NMR (1977)
(8) W.D.Knight, Nuclear Magnetic Resonance Shift in Metals,
Phys.Rev.76, 1259 (1949)
(9) R.E.Watson and L.H.Bennctt, Phys.Rev.B 15, 502 (1977)
(10) J.Korringa, Physica 16, 601 (1950)
(11) J.W.Ross, F.Y.Fradin, L.L.Isaacs,and D.J.Lam, Phys. Rev. 183, 3 (1969)
(12) C.L.Fu, X.Wang, Y.Y.Ye, and K.M.Ho,Intermetallics 7, 179
(13) A.Chikdene, A.Baudry, P.Boyer, S.Miraglia, D.Fruchart
and J.L.Soubeysoux, Z.Phys. Chem. 163, 219 (1989)
(14) H.G.Salunke, G.P.Das, P.Raj, V.C.Sahni and S K.Dhar,
Physica C 226, 485 (1994)
(15) R.Kuentzler and R.M.Watertrat, Solid State Commun. 54,
517 (1985)
(16) E.E.Havinga, H.Damsna and J.M.Kanis, J.Less-Common Met. 27, 169 (1972)
(17) F.Aubertin and S.J.Campbell, Hyperne Interactions 54, 767 (1990)
(18) H.G.Salunke, R.Mittal, G.P.Das and S.L.Chaplot, J. Phys. Condens. Matter. 9, 10137 (1997)
(19) S.L.McCarthyt, Journal of Physics, Vol.63, No.2 (2004)
(20) B.T.Matthias and E.Corenzwit, Phys.Rev.100, 626 (1955)
(21) E.E.HAVINGA, H.DAMSMA and J.M.KANlS, Physica C 226,
Issues 3-4, 10 (1994)
(22) W.L.McMillan, Phys.Rev.167, 331 (1968)
(23) P.B.Allen and R.C.Dynes, Phys.Rev.B 12, 905 (1975)
(24) H.Okamoto, H.Taniguti, and Y.Ishihara, Phys.Rev.B 53, 384 (1996)
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