磷摻雜對鐵基超導LaOFeAs1-xPx 磁有序及超導特性的影響

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/71663

Title:	磷摻雜對鐵基超導LaOFeAs1-xPx 磁有序及超導特性的影響
Authors:	陳樹希;Chen,Shu-Shi
Contributors:	物理學系
Keywords:	超導;磁有序
Date:	2016-07-05
Issue Date:	2016-10-13 13:28:47 (UTC+8)
Publisher:	國立中央大學
Abstract:	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.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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