姓名 |
陳樹希(Shu-Shi Chen)
查詢紙本館藏 |
畢業系所 |
物理學系 |
論文名稱 |
磷摻雜對鐵基超導LaOFeAs1-xPx 磁有序及超導特性的影響
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相關論文 | |
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摘要(中) |
本篇論文討論的鐵基超導材料LaOFeAs1-xPx ( x =0.4,0.44,0.48),是以不同比例的磷原子摻雜於無超導性的材料LaOFeAs中而構成。我們研究其晶體結構,磁性行為,磁有序參數,磁結構以及超導的研究。以固態反應法製備樣品,並以中子繞射儀判定其結構。
隨磷摻雜比例的提升,磁化強度也會變大,而x = 0.48相較其它的樣品有着較大的磁化強度,x = 0.4則相較其它的樣品有着較小的磁化強度約為10-5 emu/g。從磁化曲線能夠初步判斷x =0.4,0.44,0.48皆有着鐵磁的磁有序特性,接著再以中子繞射譜圖,擬合磁結構模型,確定樣品的磁性及磁矩方向。最後由磁化曲線得知樣品的超導溫度。 |
摘要(英) |
We study iron-base superconductor material LaOFeAs1-xPx ( x =0.4,0.44,0.48). This material is composed of different fraction phosphorus and LaOFeAs which is not superconductor material. Crystal structure is tetragonal, space group is P4/nmm and it is layer structure which composed of La2O2 and Fe2As2. Sample is made by soild reaction and magnetic behavior, neutron diffraction, orderparameter, magnetic structure are stuied.
Magnetization of x = 0.48 which is the largest value is 0.17 (emu/g) and x = 0.4 has the most small magnetization (~10-5 emu/g) . Magnetic structures for three samples are ferromagnetic arrangement, and magnetic moment direction are [111]determined by GSAS. Moment for x =0.4,0.44,0.48 are respectly 0.71(1)μB, 0.55(8) μB, 0.01μB . Superconductor temperature of x =0.44,0.48 are respectly 8 K and 10.4 K. |
關鍵字(中) |
★ 超導 ★ 磁有序 |
關鍵字(英) |
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論文目次 |
摘要 i
Abstract ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 x
第一章 簡介 1
1.1 鐵基超導簡介 1
第二章 實驗儀器及原理介紹 6
2.1 物理特性量測系統(PPMS) 6
2.2 超導量子干涉振動磁量儀 8
2.3 X光繞射儀 10
第三章 中子繞射原理 12
3.1 核繞射與磁繞射 12
3.2 高強度粉末中子繞射儀 (Wombat) 15
3.3 樣品製備 16
3.4 結構分析 18
第四章 磷摻雜對磁相變參數之影響 26
4.1 磁化率與磁矩 26
4.2 磁有序參數 39
4.3 磁結構 42
4.4 磷摻雜對超導溫度之影響 49
第五章 結論 54
參考文獻 55 |
參考文獻 |
[1] 中央研究院電子周報1200期
[2] Hideo Hosono et al., Iron-Based Layered Superconductor: LaOFeP. JACS(2006)
[3] Hideo Hosono et al., Superconductivity at 43 K in an iron-based layered
compound LaO1-xFxFeAs. Nature letters. vol 453,(2008)
[4] Zhu-An Xu et al., Two superconducting domes separated by a possible Lifshitz transition in LaFeAs1-xPxO. Journal of applied physics 119, 083903 (2016)
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[7] http://www.squid.ufscar.brdocumentsfilesSQUIDVSM25.pdf
[8] C. Kittel, Introduction to Solid State Physics 8th edition, ISBN978-0-471-41526-8
[9] G.E. Bacan : Neutron Differaction ,University of Sheffield, Oxford Press, 1975.
[10] http://www.ansto.gov.au/
[11] Zhu-an Xu et al., Superconductivity in LaFeAs1−xPxO: effect of chemical pressures and bond covalency. EPL 86 47002 (2009)
[12] Wang C. et al., Phys. Rev. B, 79 (2009) 054521.
[13] Zhu-An Xu et al., Two superconducting domes separated by a possible Lifshitz transition in LaFeAs1-xPxO. Journal of applied physics 119, 083903 (2016)
[14] 陳佳塘, 顆粒間交互作用抑制鋁奈米微粒超導行為,中央大學碩士論文,民國98年
[15] Ashcroft/Mermin, Solid state physics, ISBN-13: 978-0030839931 |
指導教授 |
李文献
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審核日期 |
2016-7-5 |
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