Magneto-Electrodynamics of High Temperature Superconductors

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，在正常和超导状态下。利用圆极化辐射测量超导薄膜的磁传输随频率和温度的变化，然后进行kramers-Kronig分析，将确定完整的复频率依赖的磁导张量。这些资料中最近发现的特征与涡旋钉钉有关；杂化涡旋钉扎/回旋共振、杂化涡旋钉扎/涡旋核共振以及低频脱屑损耗带将是实验工作的重点。研究离子注入对涡旋钉钉性能的影响。其他课题包括约瑟夫森等离子体，以及超导磁盘阵列的等离子体和磁等离子体模式的研究。这些研究是新颖的，将为高温超导提供新的信息，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澄清磁场与铜（高Tc）超导体的相互作用。这些超导体在电机和发电机中具有应用潜力，其中无损耗的导电和潜在的高强度磁场可以导致更小，更轻，更高效的电机和发电机。由于铜材料内部的磁力线产生热的运动，到目前为止还没有充分利用这种潜力。这种运动，以及如何通过辐照或其他方法引入“钉针”来减少这种运动，是有待澄清的主题之一。因此，这项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同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，涉及研究生，他们将接受良好的培训，进入工业、政府或教育部门。这个实验研究是关于红外线和红外线的II型超导体的微波磁光性质，重点是铜酸盐，在正常和超导状态。利用圆极化辐射测量超导膜的磁传输随频率和温度的变化，然后进行Kramers-Kronig分析，将确定完整的复频率相关磁导张量。这些资料中最近发现的特征与涡旋钉钉有关；杂化涡旋钉扎/回旋共振、杂化涡旋钉扎/涡旋核共振以及低频脱屑损耗带将是实验工作的重点。研究离子注入对涡旋钉钉性能的影响。其他课题包括约瑟夫森等离子体，以及超导磁盘阵列的等离子体和磁等离子体模式的研究。这些研究是新颖的，将为高温超导提供新的信息，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澄清磁场与铜（高Tc）超导体的相互作用。这些超导体在电机和发电机中具有应用潜力，其中无损耗的导电和潜在的高强度磁场可以导致更小，更轻，更高效的电机和发电机。由于铜材料内部的磁力线产生热的运动，到目前为止还没有充分利用这种潜力。这种运动，以及如何通过辐照或其他方法引入“钉住中心”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一种改进的电气技术。这项研究的结果可能包括不同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，涉及研究生，他们将接受良好的培训，进入工业、政府或教育部门。* * *

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. ***