Magneto-Electrodynamics of High Temperature Superconductors

高温超导体的磁电动力学

• 批准号: 9705129
• 负责人: H. Dennis Drew
• 金额: $ 30万
• 依托单位: University of Maryland, College Park
• 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: 1997-07-15 至 2001-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9705129&HistoricalAwards=false
• 关键词: Magneto; Electrodynamics; Temperature; Superconductors

w:\awards\awards96\num.doc 9705129 Drew This experimental research is on the infrared and microwave magneto-optical properties of Type II superconductors, with emphasis on cuprates, in both normal and superconducting states. Measurements of magneto-transmission of superconducting films using circularly polarized radiation with frequency and temperature variation, followed by kramers-Kronig analysis will determine the full complex frequency-dependent magneto- conductivity tensor. Features in such data recently discovered to be related to vortex pinning; the hybridized vortex pinning/cyclotron resonance, the hybridized vortex pinning/vortex core resonance, and the low frequency depinning loss band, will be a focus of the experimental work. The effects on these properties of vortex pinning as introduced by ion implantation will be studied. Additional topics include studies of Josephson plasmons, and of plasma and magneto-plasma modes of arrays of superconducting disks. These studies are novel and will provide new information on high temperature superconductivity, with the possibility of opening new paths for the science and technology of superconductivity. %%% This experimental research project makes use of sophisticated optical measurements to clarify the interaction of magnetic fields with cuprate (high Tc) superconductors. These superconductors have the potential for application in motors and generators, where the loss-free electrical conduction and potentially high levels of magnetic field could lead to smaller, lighter, and more efficient motors and generators. The full exploitation of this potential has not been reached thus far, because of heat generating motions of the magnetic field lines inside the cuprate material. Such motions, and how they may be reduced by introduction of "pinning cent ers" by irradiation or other means, are one of the topics to be clarified. This experimental grant may thereby help to develop an improved electrical technology. Results from this research may include unusual new effects or structures which may find application in 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. *** This experimental research is on the infrared and microwave magneto-optical properties of Type II superconductors, with emphasis on cuprates, in both normal and superconducting states. Measurements of magneto-transmission of superconducting films using circularly polarized radiation with frequency and temperature variation, followed by Kramers-Kronig analysis will determine the full complex frequency-dependent magneto- conductivity tensor. Features in such data recently discovered to be related to vortex pinning; the hybridized vortex pinning/cyclotron resonance, the hybridized vortex pinning/vortex core resonance, and the low frequency depinning loss band, will be a focus of the experimental work. The effects on these properties of vortex pinning as introduced by ion implantation will be studied. Additional topics include studies of Josephson plasmons, and of plasma and magneto-plasma modes of arrays of superconducting disks. These studies are novel and will provide new information on high temperature su perconductivity, with the possibility of opening new paths for the science and technology of superconductivity. %%% This experimental research project makes use of sophisticated optical measurements to clarify the interaction of magnetic fields with cuprate (high Tc) superconductors. These superconductors have the potential for application in motors and generators, where the loss-free electrical conduction and potentially high levels of magnetic field could lead to smaller, lighter, and more efficient motors and generators. The full exploitation of this potential has not been reached thus far, because of heat generating motions of the magnetic field lines inside the cuprate material. Such motions, and how they may be reduced by introduction of "pinning centers" by irrradiation or other means, are one of the topics to be clarified. This experimental grant may thereby help to develop an improved electrical technology. Results from this research may include unusual new effects or structures which may find application in 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 9705129德鲁 本实验研究的是II型超导体的红外和微波磁光性质，重点是铜酸盐，在正常和超导状态。 超导薄膜的磁透射测量 圆 偏振辐射， 频率 和温度变化，然后进行kramers-Kronig分析， 的 充分 复杂 频率相关 磁导张量 最近发现的这些数据中的特征， 被 与涡旋钉扎有关;杂交的 涡钉扎/回旋共振、混合涡钉扎/涡核共振以及低频去钉扎损耗带将是实验工作的重点。 将研究离子注入引入的涡旋钉扎对这些性质的影响。 其他主题包括约瑟夫森等离子体，等离子体和磁等离子体模式的超导磁盘阵列的研究。 这些研究是新颖的，将为高温超导提供新的信息，并有可能为超导科学和技术开辟新的道路。 这个实验研究项目利用复杂的光学测量来阐明磁场的相互作用 与 铜酸 （高 Tc） 超导体 这些超导体具有应用于电动机和发电机的潜力， 其中无损耗的电传导 并且潜在的高水平磁场可以导致更小、更轻和更有效的电动机和发电机。 由于铜酸盐材料内部的磁场线的发热运动，迄今为止尚未达到这种潜力的充分利用。 这种运动，以及如何通过辐照或其他手段引入“钉扎中心”来减少它们，是有待澄清的主题之一。 这一实验拨款可能有助于开发一种改进的电气 技术. 这项研究的结果可能包括不寻常的新效果或结构，可能会在技术上得到应用。 这个研究项目是跨学科的性质，涉及研究生谁将得到良好的培训，进入行业，政府或教育职位。 *** 本实验研究的是II型超导体的红外和微波磁光性质，重点是铜酸盐，在正常和超导状态。 超导薄膜的磁透射测量 圆 偏振辐射， 频率 和温度变化，然后通过Kramers-Kronig分析将确定 的 充分 复杂 频率相关 磁导张量最近发现这些数据中的特征 相关 到 涡流 钉扎; 的 杂交 涡钉扎/回旋共振、混合涡钉扎/涡核共振以及低频去钉扎损耗带将是实验工作的重点。将研究离子注入引入的涡旋钉扎对这些性质的影响。其他主题包括约瑟夫森等离子体，等离子体和磁等离子体模式的超导磁盘阵列的研究。这些研究具有新颖性，将为高温超导提供新的信息，并有可能为超导科学和技术开辟新的道路。 这个实验研究项目利用复杂的光学测量来阐明磁场的相互作用 与 铜酸 （高 Tc） 超导体 这些超导体具有应用于电动机和发电机的潜力， 其中无损耗的电传导 并且潜在的高水平磁场可以导致更小、更轻和更有效的电动机和发电机。 由于铜酸盐材料内部的磁场线的发热运动，迄今为止尚未达到这种潜力的充分利用。这样的运动，以及如何通过辐射或其他手段引入“钉扎中心”来减少它们，是需要澄清的主题之一。 因此，这项实验拨款可能有助于开发改进的电气技术。这项研究的结果可能包括不寻常的新效果或结构，可能会在技术上得到应用。这个研究项目是跨学科的性质，涉及研究生谁将得到良好的培训，进入行业，政府或教育职位。 ***