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Author: 楊名正
Thesis Title: Properties of alkaline earth metal intercalated in FeySe1-xTex system by ammonothermal method
Advisor: 徐永源
Degree: 碩士
Master
Department: 物理學系
Department of Physics
Thesis Publication Year: 2013
Academic Year: 101
Language: 英文
Number of pages: 49
Keywords (in Chinese): 超導鐵基超導體氨熱法
Keywords (in English): Superconductivity, Iron-based superconductor, ammonothermal method, Sr, Fe, Se, Te
Thesis Type: Academic thesis/ dissertation
Reference times: Clicks: 121Downloads: 4
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  • 摘要

    近年鐵基超導體:鐵硒、鐵硒碲和鉀鐵硒相繼被發現超導特性,經比較其超導相變溫度和晶格結構分析後,普遍認為鐵硒層狀結構的距離和其超導相變溫度成正相關關係。「氨熱法」是一種將金屬溶解於液態氨當中,讓金屬原子嵌入鐵硒的層狀結構之間的方法。實驗結果經氨熱法反應後的樣本晶格長度明顯增長,甚至超過原本預期的長度,且超導相變溫度也確實大幅增加。這是因為在氨熱法的過程中,除了原本預期的金屬原子外,連氨分子也一起嵌入了結構之內。

    在本篇文章裡,由於鐵硒碲是在做氨熱法須預備的重要材料,我們首先探討鐵硒碲的超導特性品質與其成分的關係,從中我們學到了一些關於鐵硒碲的合成特性以及與超導品質的關係。

    鍶嵌入鐵硒層的實驗非常成功,我們找到了其超導特性並探討了相關的磁性和結構。

    在鹼金嵌入鐵硒碲層方面的實驗就沒那麼順利,我們發現了一些奇特的磁性現象,文章中將介紹我們觀察到的現象,包含磁性和結構部份。

    Abstract

    Iron-based superconductor KFe2Se2 (122-structure) was been reported soon after the discovery of FeSe and FeSe1-xTex (11 structure) system. From the results of lattice structure and critical temperature of the system, enlargement of the distance between FeSe layers is believed positive to enhance Tc. Ammothermal method, by dissolving metallic atoms in liquid ammonia, is reported a way to intercalate them into FeSe layers. The greatly enhanced the size of lattices and Tc after the intercalation was achieved, and not only metallic atoms but also ammonia molecular is intercalated into the structure.

    In this article, we first surveyed the quality of superconductivity with different ratio FeSe1-xTex., which is the most important material of intercalation. Some facts of compounding FeSe1-xTex samples are learned

    Strontium is successfully intercalated in FeSe layers by the method, the superconductive and magnetic properties and also the lattices structure are measured and calculated. .

    The experiments of alkaline earth metal intercalating into FeSe1-xTex.is also applied. But the result is not as expected and with uncertain problems. Strange magnetic behaviors and structures are discussed

    Key Words: , , , .

    Contents Abstract (English) Abstract (Chinese) Contents Acknowledgements List of Figures Chapter 1 Introduction 1.1 Briefing of superconductivity 1 1.2 Iron based superconductor 4 1.3 Motivation 8 Chapter 2 Experimental Details 2.1 Sample preparation 9 2.2 X-ray diffraction 14 2.3 Electrical resistance measurement 16 2.4 Magnetism measurement 19 Chapter 3 Superconductivity of FeySe1-xTex compounds of different Ratio 3.1 Results and discussions in x = 0.5 21 3.2 Results and discussions in x = 0.1 26 3.3 Results and discussions in x = 0.7 29 3.4 Summary 32 Chapter 4 Intercalation of alkaline earth metal into Fe1+xSe and FeySe1-xTex by ammonothermal method 4.1 Results and discussion of Strontium intercalated in FeSe 33 4.2 Results and discussion of Alkaline earth metal intercalated in FeySe1-xTe system 42 Chapter 5 Conclusion 49 References

    Reference
    [1] Yoichi Kamihara, Hidenori Hiramatsu, Masahiro Hirano, Ryuto Kawamura, Hiroshi Yanagi, Toshio Kamiya, and Hideo Hosono J. Am. Chem. Soc. 128 (31): 10012–10013. (2006).
    [2] Y. Kamihara, T. Watanabe, M. Hirano, and H. Hosono, J. Am. Chem. Soc. 130, 3296 (2008).
    [3] X. Wang, Q. Q. Liu, Y. X. Lv, W. B. Gao, L. X. Yang, R. C. Yu, F. Y. Li, and C. Q. Jin, Solid State Commun. 148, 538 (2008).
    [4] J. H. Tapp, Zh. Tang, B. Lv, K. Sasmal, B. Lorenz, P. C. W. Chu, and A. M. Guloy, Phys. Rev. B 78, 060505 (2008).
    [5] H.-H. Wen and S. Li, Ann. Rev. Condens. Matter Phys. 2, 121 (2011)
    [6] Fong-Chi Hsu, Jiu-Yong Luo, Kuo-Wei Yeh, Ta-Kun Chen, Tzu-Wen Huang, Phillip M. Wu,.Yong-Chi Lee, Yi-Lin Huang, Yan-Yi Chu, Der-Chung Yan, and Maw-Kuen Wu PNAS 105 (38): 14262–14264 (2008)
    [7] Kuo-Wei Yeh, Tzu-Wen Huang, Yi-lin Huang, Ta-Kun Chen, Fong-Chi Hsu, Phillip M. Wu, Yong-Chi Lee, Yan-Yi Chu, Chi-Lian Chen, Jiu-Yong Luo, Der-Chung Yan and Maw-Kuen Wu EPL, 84 (2008) 37002
    [8] Guo J G, Jin S F, Wang G, Wang S C, Zhu K X, Zhou T T, He M and Chen X L 2010 Phys. Rev.B82 180520
    [9] Ming-Hu Fang, Hang-Dong Wang, Chi-Heng Dong, Zu-Juan Li, Chun-Mu Feng, Jian Chen and H. Q. Yuan EPL 94 27009 (2011)
    [10] T. P. Ying, X. L. Chen, G. Wang, S. F. Jin, T. T. Zhou, X. F. Lai, H. Zhang, and W. Y. Wang Sci Rep. 2012; 2: 426.
    [11] H. Okamoto Journal of Phase Equilibria, 12 (1991), p. 383
    [12] H. Okamoto, L. E. Tanner Bulletin of Alloy Phase Daigram Vol. 11 No.4 1990
    [13] Matthew Burrard-Lucas, David G. Free, Stefan J. Sedlmaier, Jack D. Wright, Simon J. Cassidy, Yoshiaki Hara, Alex J. Corkett, Tom Lancaster, Peter J. Baker, Stephen J. Blundell, Simon J. Clarke Nature Materials 12, 15–19 (2013) doi:10.1038/nmat3464

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