SGER: A Non-Conductive Pressure Cell for Pulsed Magnetic Field Experiments in Anisotropic Superconductors

SGER：用于各向异性超导体脉冲磁场实验的非导电压力单元

• 批准号: 0331272
• 负责人: Charles Agosta
• 金额: $ 7.71万
• 依托单位: Clark University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-11-01 至 2005-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0331272&HistoricalAwards=false
• 关键词: SGER; Non; Conductive; Pressure; Cell

This Small Grants for Exploratory Research (SGER) project will develop a novel, non-conducting pressure cell for use in pulsed magnetic fields. The miniature gas pressure cell will be designed and built out of plastic or ceramic materials. It will be useful from ambient pressure up to about 3 kbar. This range is very difficult to control with clamp-type cells. There are many important and interesting changes in the properties of electronic materials in this low-pressure range. The cell will be designed for use with a tunnel diode oscillator (TDO), which can be used in arbitrarily small volumes. The TDO apparatus uses an rf signal to probe the penetration depth, resistance, or magnetization of a sample, and works equally well in dc and pulsed magnetic fields. This unique combination of the TDO in a pressure cell will allow detailed studies of the physics of anisotropic organic and heavy fermion conducting systems as a function of pressure. The cell will be used to study how the physical structure of a material affects its electronic structure, and how the electronic structure determines the ground state. In particular, the anisotropic nature of organic and heavy fermion superconductors allows one to eliminate the orbital destruction of superconductivity and to probe the spin coupling or Pauli paramagnetic limit. In this limit the critical magnetic fields are near both the Zeeman energy and the Fermi energy. Both graduate and undergraduate students will be involved in this project. These students will have the experience of working on an exploratory research project. They will also gain the experience of designing and building new apparatus.This Small Grants for Exploratory Research (SGER) project will develop a novel, non-conducting pressure cell that will be useful to study the electronic structure of superconductors. Superconductors are advanced materials that can conduct electricity without losing any of their electrical energy. Superconductors are already used to make the high magnetic fields necessary for MRI imaging in hospitals, and if made more practical, superconductivity would revolutionize the entire electrical power industry. The cell will be designed for use with a tunnel diode oscillator (TDO), which can be used in arbitrarily small volumes. A TDO uses a radio signal to probe the penetration depth, a fundamental property of superconducting materials. The unique combination of the TDO in a pressure cell will allow detailed studies of the physics of anisotropic organic and heavy fermion superconducting systems as a function of pressure. These systems are layered materials that show special properties because of their physical structure. The cell will be used to learn how the physical structure of a material affects its electronic behavior. In particular it will be used to understand how the layered structure of the organic and heavy fermion superconductors makes them behave differently from traditional superconductors. Both graduate and undergraduate students will be involved in this project. These students will have the experience of working on an exploratory research project. They will also gain the experience of designing and building new apparatus.

这项探索性研究（SGER）小额赠款项目将开发一种用于脉冲磁场的新型非导电压力电池。微型气体压力电池将由塑料或陶瓷材料设计和制造。它将从环境压力高达约3kbar有用。这个范围是非常难以控制钳型电池。在这个低压范围内，电子材料的性质发生了许多重要而有趣的变化。该电池将被设计为与隧道二极管振荡器（TDO）一起使用，可以在任意小的体积中使用。TDO装置使用射频信号来探测样品的穿透深度、电阻或磁化，并且在直流和脉冲磁场中同样有效。这种独特的TDO在压力电池中的组合将允许详细研究各向异性有机和重费米子传导系统的物理特性，作为压力的函数。该电池将用于研究材料的物理结构如何影响其电子结构，以及电子结构如何决定基态。特别是，有机超导体和重费米子超导体的各向异性使人们能够消除超导性的轨道破坏，并探测自旋耦合或泡利顺磁极限。在这个极限中，临界磁场既接近塞曼能，也接近费米能。研究生和本科生都将参与这个项目。这些学生将有从事探索性研究项目的经验。他们还将获得设计和制造新设备的经验。这项探索性研究（SGER）项目将开发一种新型的非导电压力电池，这将有助于研究超导体的电子结构。超导体是一种先进的材料，它可以导电而不损失任何电能。超导体已经被用于制造医院核磁共振成像所必需的高磁场，如果更实用，超导将彻底改变整个电力工业。该电池将被设计为与隧道二极管振荡器（TDO）一起使用，可以在任意小的体积中使用。TDO使用无线电信号探测穿透深度，这是超导材料的基本特性。TDO在压力电池中的独特组合将允许详细研究各向异性有机和重费米子超导系统作为压力函数的物理特性。这些系统是层状材料，由于其物理结构而表现出特殊的性能。该电池将用于研究材料的物理结构如何影响其电子行为。特别是，它将被用来理解有机和重费米子超导体的分层结构如何使它们的行为与传统超导体不同。研究生和本科生都将参与这个项目。这些学生将有从事探索性研究项目的经验。他们还将获得设计和制造新设备的经验。