Low Temperature Studies of Heavy Electron Superconductors

重电子超导体(UPt3、URu2Si2、UPd2A13等)超导电性的非常规性质将通过超声波、磁性和电磁测量进行探索。这些超导体中的相图与单轴应变、磁场和杂质的关系将用超声波绘制出来。结果将与Ginzburg Landau理论的预测进行比较，以约束多组分有序参数。我们将使用低温扫描显微镜技术来研究这多个相的涡旋态。最初的实验将用我们部分开发的磁力显微镜进行。最后，我们建议研究这些超导体对电磁波的新颖响应。这些超导体中出现的不寻常的频率相关性将被研究到2 GHz的频率。%的重费米子材料表现出非凡的电学性质，有些材料表现出超导电性。对薄膜的测量应该会对这些极不寻常的材料的行为提供有价值的见解。

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.