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標題: La0.9Re0.1Ag0.9Mn0.1超導特性的研究
The superconducting properties of La0.9Re0.1Ag0.9Mn0.1
作者: 林庭緯
Ting-Wei Lin
關鍵字: 超導;superconductor
引用: [1] HEIKE K AMERLINGH O NNE S, Nobel Lecture, 1913 [2] Superconductivity,Wikipedia,2005. [3] 羅會仟, 神奇的超導【圖片版】,科學網,2012 [4] U. Gottlieb; J. C. Lasjaunias; J. L. Tholence; O. Laborde; O. Thomas; R. Madar, Superconductivity in TaSi2 single crystals, PHYSICAL REVIEW B , 1992 [5] 李聖尉, 蔡志申, 磁性物質,科學online,2011 [6] magnetic susceptibility, Wikipedia ,2013 [7] 稀土磁性材料——磁性材料概述——物質的磁性——反鐵磁性及亞鐵磁性, 金屬材料專業知識百科網,2012 [8] antiferromagnetism, Wikipedia,2015. [9] 固體材料的結晶性質,科技台灣,2012 [10] 從結構、衰減、性能透析單晶與多晶本質 ,索比光伏網,2016 [11] 林麗娟,光繞射儀原理及其應用,工業材料,1911 [12] 蔡坤龍, X-射線技術於環境化學分析之應用, 環境檢驗電子報,2011 [13] Josephson effect,Wikipedia,2017 [14] 超導量子干涉儀與應用,中國電子科學研究院官方學術資訊平臺2017 [15] 電子天平為何精度如此高?是什麼原因,壹讀,2015 [16] Wheatstone bridge, Wikipedia,2017 [17] 胡立發,周廉,張平祥,高溫超導體的磁化與磁滯損耗, 物理學報,2001 [18] C.C. Chao, Superconductivity of LaAg, Journal of Physical Chemistry ,1966 [19] A. Sekkal , A. Benzair , T. Ouahrani , H.I. Faraoun , G. Merad , H. Aourag , C. Esling, Mechanical properties and bonding feature of the YAg, CeAg, HoCu,LaAg, LaZn, and LaMg rare-earth intermetallic compounds: An ab initio study, Intermetallics ,2013 [20] S. Kumar, S. N. Kaul,, J. Rodríguez Fernández, L. Fernández Barquín, P. F. Henry , Correlation between site preference of ternary Mn addition in LaAg and superconductivity, Journal of Applied Physics ,2008 [21] S. Kumar, S. N. Kaul, J. Rodríguez Fernández, L. Fernández Barquín , Antiferromagnetic-spin-fluctuation-mediated pairing as a likely mechanism for unconventional superconductivity in LaAg1−cMnc alloys ,2009 [22] S. Kumar , S.N. Kaula, J. Rodríguez Fernández , L. Fernández Barquín, Critical current density and flux pinning in an unconventional superconductor ,2009
在1966年,美國科學家C.C.Chao就發現CsCl結構的LaAg合金是超導體(Tc=0.9K) [18] [19]。在2009年,LaAg合金只是多參雜了一個磁性元素Mn,Tc馬上升到5K附近[20]。因為在BCS理論中磁性對超導的影響是非常嚴重的問題,BCS理論對磁性元素會造成Tc的上升,不能做出合理的解釋,所以我們很好奇磁性離子在超導扮演的角色,為了釐清磁性離子對超導的影響,我們摻雜磁性離子(特別是稀土元素)到LaAg合金。
我們以電弧氬焊,製作了摻雜稀土元素的La0.9RE0.1Ag0.9Mn0.1樣品(RE=Gd、Dy、Ho、Er元素), 其中Ho0.1La0.9Ag0.9Mn0.1、Er0.1La0.9Ag0.9Mn0.1樣品在高溫區時,磁化率隨著溫度上升而下降,明顯符合居禮定律;在低溫區,有超導向轉變。

The intermetallic compound LaAg with CsCl-type structure was founded to be superconductor (Tc=0.9K) by American scientist C.C.Chao in 1966 [18] [19]. Furthermore it was found that the superconducting transition temperature Tc was enhanced to 5k with minor doping of magnetic element Mn in the LaAg system In 2009. For a long time, the magnetic elements play a peculiar character in the development of the superconductivity history, in particular to the BCS theory. It couldn't make a reasonable explanation how magnetic element enhances Tc. So we were curious about the role of the magnetic ions appeared in this superconducting system. In this research, we doped rare earth magnetic ions to the intermetallic compound LaAg in order to clarify the interplay between the magnetism and the superconductivity,.

We used arc argon welding to produce specimens of La0.9RE0.1Ag0.9Mn0.1 (RE=Gd、Dy、Ho、Er elements). The magnetic susceptibility decreased with temperature in the high temperature region were detected in the Ho0.1La0.9Ag0.9Mn0.1 and Er0.1La0.9Ag0.9Mn0.1 compounds. Obviously, the behavior is consistent with the Curie-Weiss law. Surprisingly, a superconducting transition was observed around 5.5 K in both systems at low temperature region.
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