National Changhua University of Education Institutional Repository : Item 987654321/18823

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NCUEIR > College of Science > Department of Physics > NSC Projects > Item 987654321/18823

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/18823

Title:	高溫超導體內稟磁通釘扎與人造釘扎中心的研究 Study of Intrinsic Flux Pinnings and Artificial Pinning Centers for High-Tc Superconductors
Authors:	洪連輝;吳仲卿
Contributors:	物理學系
Keywords:	高溫超導體;磁通釘扎;臨界電流密度;近鄰效應;電子微影術 High Tc superconductor;Flux pinning;Critical current density;Proximity effect;Electron beam lithography
Date:	1998
Issue Date:	2014-08-06T05:02:44Z
Abstract:	本計畫主要的目的在探討高溫超導體的磁通釘扎機制，假設樣品是由週期性陣列之釘扎中心所組成，而釘扎中心能量為指數型態，我們計算磁通蠕動所產生的電阻，變換不同的釘扎中心的大小或距離，我們也找到最佳化的釘扎中心大小，另外我們也仔細測量樣品隨磁場變化的電阻，其電壓被量測到很低的電壓，我們發現到用超導磁通蠕動模型可以有效的解釋此一實驗數據結果，也說明了磁場對溫度的相圖。 The purpose of this study will investigate the mechanism of flux pinning for high-Tc superconductors. We assume a periodic array pinning centers in the superconducting thin films, which the potential energy of the pinning centers has a exponential form, and simulate to calculate the resistivity of flux creep. When we make a variation in the distance between pinning centers and the pinning size, we find the optimal pinning size which has minimal dissipative energy. Further, the resistivity of the samples with magnetic fields are measured under very low voltage in detail. Using the flux creep model, we can explain the data reasonably, and illustrate the magnetic field-temperature phase diagram.
Relation:	國科會計畫, 計畫編號: NSC87-2112-M018-006; 研究期間: 8608-8707
Appears in Collections:	[Department of Physics] NSC Projects

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