Acquisition of a Helium Liquefier

该合同为替换由明尼苏达大学物理与天文学院运行了20年的氦气液化器模块提供部分支持，并翻新两个1400系列压缩机。该系统将用于向凝聚态物理小组以及明尼苏达大学物理小组以外的其他研究小组提供液氦。在凝聚态物理组的研究依赖于液氦的可用性，包括“奇异超导体的配对光谱”，“磁性超导体界面结构和高温超导化合物”，“有序和无序超导体中的隧道和输运”，“超流体4He流通过微观孔的相滑移”，“磁性粒子的磁化反转”。经典与量子体制”，“金属的超低温特性”和“低维系统中的量子相变”。凝聚体以外的用户包括天文系，它有一个红外天文学项目，望远镜位于双城以东的圣克罗伊岛的海洋，化学，生物化学（生物科学和医学院学院），药物化学和放射学系。后一种组织支持大量的核磁共振设施和一些小规模的核磁共振设置。其他用户在电气工程和地质学。电气工程方面的工作主要集中在舒布尼科夫-德哈斯对半导体材料的研究上，地质学方面的工作主要集中在磁性矿物和趋磁细菌上。约有42名教师，40名博士后，62名研究生，26名本科生，超过9个学科/部门将受益。%%%***

9802872GoldmanThis award provides partial support to replace a Helium Liquefier module operated for the last 20 years by the School of Physics and Astronomy at the University of Minnesota, and to refurbish two series 1400 compressors. The system will be used to supply liquid helium to the Condensed Matter Physics Group, and to other research groups outside of Physics at the University of Minnesota. In the Condensed Matter Physics Group research dependent on the availability of liquid helium, includes programs on "Pairing Spectroscopy of Exotic Superconductors," "Magnetic Superconductor Interface Structures and High Temperature Superconducting Compounds," "Tunneling and Transport in Ordered and Disordered Superconductors," "Phase Slip in Superfluid 4He Flow through Microscopic Apertures," "Magnetization Reversal in Magnetic Particles: Classical and Quantum Regimes," "Ultra-low Temperature Properties of Metals," and "Quantum Phase Transition in Low-Dimensional Systems." Users outside Condensed Matter include the Astronomy Department, which has a program of Infrared Astronomy with a telecope situated at Marine on St. Croix, east of the Twin Cities, the Chemistry, Biochemistry (College of Biological Sciences and Medical School), Medicinal Chemistry, and Radiology Departments. The latter organizations support a large number of NMR facilities, and several small-scale MRI setups. Additional users are in Electrical Engineering and Geology. The work in Electrical Engineering is focused on Shubnikov-de Haas studies of semiconducting materials, and that in Geology with magnetic minerals and magnetotactic bacteria. Approximately 42 faculty, 40 post doctorals, 62 graduate students, 26 undergraduates, in more than nine disciplines/departments will benefit.%%%***