Low Temperature Studies of Heavy Electron Superconductors

重电子超导体的低温研究

• 批准号: 9218775
• 负责人: Bellave Shivaram
• 金额: $ 24.5万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-15 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9218775&HistoricalAwards=false
• 关键词: Low; Temperature; Studies; Heavy; Electron

The unconventional nature of superconductivity in the heavy electron superconductors (UPt3, URu2Si2, UPd2A13 etc.) will be explored via ultrasound, magnetic and electromagnetic measurements. The dependence of the phase diagrams in these superconductors on uniaxial strain, magnetic field and impurities will be mapped using ultrasonics. The results will be compared with predictions of Ginzburg Landau theories to place constraints on the multicomponent order parameters. Vortex states in these multiple phases will be studied using low temperature scanning microscopy techniques. Initial experiments will be carried out with a magnetic force microscope which we have partially developed. Finally, we propose to study the novel response of these superconductors to electromagnetic waves. The unusual frequency dependence to arise in these superconductors will be studied up to frequencies of 2GHz. %%% Heavy-fermion materials show extraordinary electronic properties, some exhibit superconductivity. Measurements on thin films should give valuable insights into the behavior of these highly unusual materials.

超导电性的非常规性质在重 电子超导体（UPt3，URu2Si2，UPd2A13等）将 通过超声波、磁性和电磁测量进行探索。 这些超导体中的相图依赖于 单轴应变，磁场和杂质将映射使用 超声波 结果将与预测进行比较， Ginzburg朗道理论对多组分的约束 顺序参数 这多个阶段的涡旋状态将是 研究使用低温扫描显微镜技术。 最初的实验将用磁力进行 这是我们开发的一部分。 最后提出 来研究这些超导体对 电磁波 不寻常的频率依赖性 在这些超导体中，将研究高达2GHz的频率。 %%% 重费米子材料显示出非凡的电子特性， 一些显示出超导性。 薄膜测量应 对这些极不寻常的动物的行为提供了有价值的见解 材料.