臺灣博碩士論文加值系統

本論文主要是研究一系列Fe1.25TeOx ( x = 0.1 ~ 0.35 )的晶體結構分析與掺雜後的磁性變化。
由X-Ray粉末繞射圖(XRD)得知利用三種粉末直接混合製成的樣品結構是最乾淨的，而取代量在x > 0.2之後其X-Ray粉末繞射圖(XRD)就開始出現雜角了，顯示掺雜量在0.2後就已達到極限。
從磁性量測的M-T圖和M-H圖中可以得知，Fe1.25TeOx這系列的樣品有spin-glass的行為特性。在Fe1.25TeO0.2時疑似出現了Tc =140 K的高溫超導ZFC與FC之反磁現象，而在x = 0.35 Fe1.25TeO0.35時變成了反鐵磁性(Antiferromagnetism)。

目錄 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧I
圖目錄 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧II
表目錄 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧VII
摘要‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧1
第一章 簡介‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧2
第二章 實驗儀器及其測量方法與理論‧‧‧‧‧‧‧‧‧‧‧‧5
2.1 X-Ray繞射儀與原理‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧5
2.2 超導量子干涉磁矩測量儀(SQUID Magnetometer) ‧‧‧9
2.3 磁性測量 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧14
2.4 電阻測量 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧18
2.5 物質磁性的分類 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧20
2.6 磁的交互作用 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧27
第三章 樣品製作流程與方法 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧31
3.1 實驗流程 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧31
3.2 樣品製作 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧32
第四章 實驗數據與分析 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧34
4.1 晶體結構 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧33
4.2 X-Ray粉末繞射相圖分析與晶格常數變化‧‧‧‧‧‧36
4.3 磁性量測(M-T圖) ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧47
4.4 磁性量測(M-H圖) ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧51
4.5 電性量測 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧64
第五章 結論 ‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧‧66

1.Zimmer B I, Jeitschko W, Albering J H, et al. The rare earth transition metal phosphide oxides LnFePO, LnRuPO and LnCoPO with ZrCuSiAs type structure. J Alloys Compd, 1995, 229(2): 238-242

2.Quebe P, Terbuchte L J, Jeitschko W. Quaternary rare earth transition metal arsenide oxides RTAsO (T=Fe, Ru, Co) with ZrCuSiAs type structure. J Alloys Compd, 2000, 302(1-2):70-74

3.Kamihara Y, Watanabe T, Hirano M, et al. Iron-based layered superconductor La[O1-xFx]FeAs(x =0.05-0.12) with Tc=26 K. Journal of the American Chemical Society, 2008, 130: 96-3297.

4.Hsu F C, Luo J Y, Yeh K W, et al. Superconductivity in the PbO-type structure α-FeSe. Proc Natl Acad Sci USA, 2008, 105(38): 14262-14264.

5.McQueen T M, Huang Q, Ksenofontov V, et al. Extreme sensitivity of superconductivity to stoichiometry in Fe1+δ Se. arXiv: 0811.1613

6.Mizuguchi Y, Tomioka F, Tsuda S, et al.Superconductivity at 27 K in tetragonal FeSe under high pressure. Appl Phys Lett, 2008, 93(15): 152505

7.Subedi A, Zhang L J, Singh D J, et al. Density functional study of FeS, FeSe, and FeTe: Electronic structure, magnetism, phonons, and superconductivity. Phys Rev B, 2008 78(13): 134514

8.Yeh K W, Huang T W, Huang Y L, et al. Tellurium substitution effect on superconductivity of the α -phase iron selenide. Europhys Lett, 2008, 84(3): 37002

9.Mizuguchi Y, Tomioka F, Tsuda S, et al. Superconductivity in S-substituted FeTe. Appl Phys Lett, 2009, 94(1): 012503

10.Mizuguchi Y, Tomioka F, Tsuda S, et al. Evolution of superconductivity by oxygen annealing in FeTe0.8S0.2. 2010, EPL, 90: 57002

11.Weidong Si, Qing Jie, Qiang Li,et al. Superconductivity in epitaxial thin films of Fe1.08Te:Ox.Physical Review B 81, 092506,2010

12.Finlayson, D.M.;Greig, G.;Llewellyn, J.S.;Smith, T. Physical Society, London (1956) 69, 860-862

13.M. H. Fang, H . M. Pham, B. Qian, T. J. Liu, E. K. Vehstedt, Y. Liu, L. Spinu, and Z. Q. Mao. Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82. Physical Review B 78, 224503,2008