Experimental Study of the Magnetic Flux Line Lattice in Superconductors

超导体磁通线晶格的实验研究

• 批准号: 9705389
• 负责人: Eva Andrei
• 金额: $ 28万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-01 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9705389&HistoricalAwards=false
• 关键词: Experimental; Study; Magnetic; Flux; Line

w:\awards\awards96\num.doc 9705389 Andrei This experimental research project focuses the interactions between quantized magnetic flux lines threading through a Type II superconductor. An ordered state of interacting flux lines, as theoretically predicted by Abrikosov, provides the conceptual basis of the experimental work. The influences of material disorder, thermal fluctuations, and the quantum nature of the flux line formation lead to an extremely complicated picture in the area of parameters where the Abrikosov lattice becomes unstable. There are questions relating to a glassy phase of the flux array, among others, which are addressed in this experimental project. The work on 2H-NbSe2 identified two states of the flux line lattice characterized by dramatically different dynamics, one being disordered and have pinning frequencies two orders of magnitude higher than the ordered lattice, and accompanied by much higher critical currents. In this project local magnetization measurements will be made using an array of microscopic Hall sensors realized in the 2-D electron gas at the interface of a GaAs/GaAlAs heterostructure. Other work includes DC and AC measurements of the shear modulus of the flux array, and measurements of transverse currents in dynamic fluxon states. Portions of the work will be done in collaboration with Dr. Eli Zeldov of the Weizmann Institute. %%% This experimental research project, is focused on the behavior of Type II superconductors in a magnetic field. In this case the magnetic field can penetrate the superconductor, in an array of quantized flux lines. Under ideal conditions these lines, each carrying one quantum of magnetic flux, arrange in an ordered array or flux lattice, as predicted theoretically by Abrikosov. This experimental project is devoted to measurement of the motions and arrangements o f the flux lines in less than ideal conditions when the flux lines may be in a disordered state or in a state of motion somewhat like a liquid. The results of this research may provide information of importance to the application of Type II superconductors including high temperature cuprate superconductors in improved electrical and electromechanical technology. This research project is interdisciplinary in nature and involves graduate students who will be excellently trained to enter positions in industry, government or education. ***

W：\ Awards \ Awards96 \ num.Doc 9705389 Andrei这个实验研究项目集中了量化的磁通量线通过II型超导体螺纹之间的相互作用。正如Abrikosov从理论上预测的那样，相互作用的通量线的有序状态为实验工作提供了概念基础。材料障碍，热波动和通量线形成的量子性质的影响导致在abrikosov lattice变得不稳定的参数区域中极为复杂的情况。有一些与通量阵列的玻璃阶段有关的问题，以及该实验项目中解决的问题。 2H-NBSE2上的工作确定了两种磁通线晶格的状态，其特征在于急剧不同的动力学，一个是无序的，并且固定频率比有序的晶格高两个数量级，并具有更高的临界电流。在此项目中，将使用GAAS/GAALAS异质结构的界面上的2-D电子气体中实现的微观霍尔传感器进行局部磁化测量。其他工作包括磁通阵列的剪切模量的直流和交流测量，以及动态磁通状态中横向电流的测量。 部分工作将与Weizmann Institute的Eli Zeldov博士合作完成。 %%％％这些实验研究项目集中在磁场中II型超导体的行为上。在这种情况下，磁场可以在一系列量化的通量线中穿透超导体。在理想条件下，这些线，每条携带一个量子的磁通量，在Abrikosov理论上预测的那样，在有序的阵列或磁通晶格中排列。 当通量线可能处于无序状态或运动状态时，该实验项目致力于测量通量线的运动和排列。这项研究的结果可能会为应用于改进的机电技术中的II型超导体（包括高温库）超导体（包括高温库）超导体提供重要性。该研究项目本质上是跨学科的，涉及研究生，他们将受到良好的培训，可以进入行业，政府或教育的职位。 ***