鉍摻雜鎳金屬奈米顆粒的超導及磁性探討

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/88252

Title:	鉍摻雜鎳金屬奈米顆粒的超導及磁性探討
Authors:	吳博鏞;Wu, Bo-Yong
Contributors:	物理學系
Keywords:	超導;鉍奈米粒子;增強;Superconductivity;Bismuth Nanoparticles;Enhanced
Date:	2022-01-27
Issue Date:	2022-07-13 20:43:08 (UTC+8)
Publisher:	國立中央大學
Abstract:	本論文所探討的是，我們利用双鍍源低真空熱蒸鍍冷凝法，來進行金屬鉍的奈米粒子製備。於實驗時控制並藉由調整鎳金屬鍍源的電流，以達到摻雜不同鎳含量樣品的目的。由於近期的新發現，在常壓下溫度小於 0.53 mK 時，鉍金屬塊材被發現具有超導現象的存在，因此我們便嘗試縮小其體積至奈米尺度，並且摻雜鎳於鉍的晶格點上，來看是否能夠對原先超導溫度極低的鉍，帶來增強其超導性質的表現。在此我們製備了粒徑為 12 nm 的菱形晶格鉍奈米粒子，在常壓下可測得其超導溫度為 4 K。然後進一步地，製備相同粒徑大小卻給予其不同摻雜鎳金屬比例的菱形晶格鉍奈米粒子，當奈米粒子樣品的摻雜鎳含量分別為 6%， 8%，以及 10% 時，其超導臨界溫度和原先未摻雜的樣品相比，分別顯著增強達到了 7 K，12 K，以及 18 K。我們同時也發現，其超導性在此可以和鐵磁性共存。 ;The topic which we discuss in the thesis is that we fabricate the sample of bismuth nanoparicles by the way of double-source evaporation with low vacuum. In order to get the samples which are different ratio of nickel doping in the bismuth, we control the current of the nickel source in the evaporation chamber. Because of the recently new finding the bulk of bismuth in ambient pressure when the temperature is below to 0.53 mK, which demonstrate that the existence of superconductivity. We would like to enhance the performance of the superconductivity of bismuth, by doping the nickel on the lattice of the bismuth, and also reduce its size as the nanoparticle scale. We fabricate the rhombohedral bismuth nanoparticles which the size are 12 nm, and the TC = 4 K in ambient pressure. For the next step, we also fabricate the rhombohedral bismuth nanoparticles which the sizes are the same, but with the different ratio of doping with nickel. We compare the sample of nanoparticles which have the same size but the ratio of doping with nickel are 6%, 8%, and 10%, and which are greatly enhanced to 7K, 12K, and 18K.We also can figure out that the phenomenon which superconductivity can coexist with ferromagnetism.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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