簡易檢索 / 詳目顯示
| 研究生： |
陳樹希 Shu-Shi Chen |
|---|---|
| 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 |
| 指導教授： | 李文献 |
| 口試委員: | |
| 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： | 2016 |
| 畢業學年度： | 104 |
| 語文別： | 中文 |
| 論文頁數： | 70 |
| 中文關鍵詞： | 超導 、磁有序 |
| 相關次數： | 點閱：19 下載：0 |
| 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。
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.
[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)
[5] http://www.qdusa.com/sitedocs/productBrochures/mag3-07.pdf
[6] http://www.qdusa.com/sitedocs/productBrochures/16TPPMS7.pdf
[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
