CAREER: Phonon Spectroscopic Studies of Anisotropic Superconductors and Dipolar Magnets

职业：各向异性超导体和偶极磁体的声子光谱研究

• 批准号: 9874930
• 负责人: Brett Ellman
• 金额: $ 34万
• 依托单位: Kent State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-02-01 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9874930&HistoricalAwards=false
• 关键词: CAREER; Phonon; Spectroscopic; Studies; Anisotropic

9874930EllmanMuch of the research in this CAREER project relies on the use of high-frequency phonons as incisive probes of unconventional superconductor (e.g., heavy fermion) gap structures. Transverse ultrasound is exceptionally suited to studies of symmetry-breaking in, for example, UPt3 under uniaxial stress, while higher frequency non-hydrodynamic phonons will be utilized in an attempt to directly "map the gaps" in k-space. Even higher energy phonons (~200 GHz) will be used to study Ising magnets possessing a "tunable" degree of disorder. Ultimately, the aim will be to spectroscopically explore the onset of glassy behavior in a system eminently amenable to theoretic analysis. The education component incorporates (a) teaching qualitative physics to non-scientists and (b) instilling an appreciation for science as a worthwhile human endeavor. Two groups will be targeted: (1) Students enrolled in a large non-mathematical physical science course, which may be the only opportunity to broaden their horizons. (2) Parents (or prospective parents) of young children. Here, the goal is to supply information to inform and augment the parents in their roles as role model and teacher. Updated course materials, demonstrations, and modern information technology will bring powerful, highly visual tools to bear on these tasks.%%% This project focuses on magnets and superconductors, which have important technological applications. Ultra-high frequency sound waves are used to probe some of these exotic materials. For superconductors, this technique gives a direct geometric "picture" of quantities that dictate the electrical behavior of the material (the superconducting "gap"). For magnets, it provides basic information about the often-puzzling roles of disorder and magnetic interaction in otherwise simple systems. The education component incorporates (a) teaching qualitative physics to non-scientists and (b) instilling an appreciation for science as a worthwhile human endeavor. Two groups will be targeted: (1) Students enrolled in a large non-mathematical physical science course, which may be the only opportunity to broaden their horizons. (2) Parents (or prospective parents) of young children. Here, the goal is to supply information to inform and augment the parents in their roles as role model and teacher. Updated course materials, demonstrations, and modern information technology will bring powerful, highly visual tools to bear on these tasks.***

9874930 Ellman这个CAREER项目的大部分研究都依赖于使用高频声子作为非常规超导体的敏锐探针（例如，重费米子）间隙结构。 横向超声特别适合于研究单轴应力下UPt 3的断裂，而更高频率的非流体动力学声子将被用于直接在k空间中“映射间隙”。 甚至更高能量的声子（~200 GHz）将用于研究具有“可调”无序度的伊辛磁体。 最终，目标将是在一个非常适合理论分析的系统中，用光谱学方法探索玻璃态行为的发生。教育部分包括（a）向非科学家教授定性物理学和（B）灌输对科学的欣赏，认为科学是一项值得人类奋进。 将针对两个群体：（1）学生报读了一门大型的非数学物理科学课程，这可能是唯一一次开阔眼界的机会。(2)幼儿的父母（或准父母）。在这里，目标是提供信息，告知和增强父母作为榜样和教师的作用。更新的课程材料、演示和现代信息技术将为这些任务带来强大的、高度可视化的工具。%该项目侧重于具有重要技术应用的磁体和超导体。超高频声波被用来探测这些奇异的物质。对于超导体，这种技术给出了一个直接的几何“图片”的数量，决定了材料的电气行为（超导“间隙”）。 对于磁体，它提供了关于无序和磁相互作用在其他简单系统中经常令人困惑的作用的基本信息。教育部分包括（a）向非科学家教授定性物理学和（B）灌输对科学的欣赏，认为科学是一项值得人类奋进。 将针对两个群体：（1）学生报读了一门大型的非数学物理科学课程，这可能是唯一一次开阔眼界的机会。(2)幼儿的父母（或准父母）。在这里，目标是提供信息，告知和增强父母作为榜样和教师的作用。更新的课程材料，演示和现代信息技术将带来强大的，高度可视化的工具来承担这些任务。