RUI: Magnetic and Superconducting Properties of Nickel Borocarbides

RUI：硼碳化镍的磁性和超导性能

• 批准号: 0704406
• 负责人: George Schmiedeshoff
• 金额: $ 25.95万
• 依托单位: Occidental College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-06-01 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0704406&HistoricalAwards=false
• 关键词: RUI; Magnetic; Superconducting; Properties; Nickel

Technical :This award will support our continuing efforts to study the coexistence and competition between magnetism, superconductivity, and heavy fermion behavior in the rare-earth nickel-borocarbides and some related systems. We will continue to measure thermal expansion and magnetostriction using a new capacitive dilatometer developed by the PI (and now in regular use at Los Alamos National Laboratory, Ames Laboratory, and the National High Magnetic Field Laboratory). These measurements will allow us to map out phase diagrams and thermodynamically characterize phase transitions between the low temperature states of these materials. Our measurements will also be combined with existing specific heat measurements in a Gruneisen analysis that will characterize the volume dependence of the characteristic energies of these fascinating materials. Undergraduates, drawn from a diverse pool of talented students, will participate in all aspects of this work, from installing samples, acquiring and analyzing data to assisting during research trips to our collaborators and their institutions.Non-Technical:From electric motors to high-capacity disk drives, magnetic materials are an intrinsic component of our increasingly technological society. Superconductivity, on the other hand, holds the promise of significant technological advancement in areas as diverse as power transmission and high speed transportation. Magnetism and superconductivity are usually mutually exclusive, so the study of materials in which both phenomena coexist and compete is important for understanding the basic physics involved and for finding new kinds of superconducting and magnetic states. This project will support our continuing efforts to study these phenomena with measurements of the thermal expansion using a new capacitive dilatometer developed by the PI (and now in regular use at Los Alamos National Laboratory, Ames Laboratory, and the National High Magnetic Field Laboratory). These measurements will allow us to better understand the competing interactions that underlie these important states of matter, to map out phase diagrams, and to thermodynamically characterize the transitions between the low temperature phases. Undergraduates drawn from a diverse pool of talented students at Occidental College (a small liberal arts college in Los Angeles) will participate in all aspects of this work, both in our on-campus laboratory and during research trips to work with our collaborators at their home institutions. In this way our students will be exposed to the environments of both "small" and "big" science.

技术：该奖项将支持我们不断努力研究稀有镍 - 波罗比德斯和某些相关系统的磁性，超导性和繁重的效率之间的共存和竞争。 我们将继续使用PI开发的新电容膨胀计（现在在Los Alamos国家实验室，AMES实验室和国家高磁场实验室）进行测量热膨胀和磁截图。 这些测量值将使我们能够绘制出相图，并在这些材料的低温状态之间进行热力学表征。 我们的测量值还将与Gruneisen分析中的现有特定热量测量结果结合使用，该测量将表征这些迷人材料的特征能量的体积依赖性。 从各种各样的才华横溢的学生中汲取的本科生将参与这项工作的各个方面，从安装样品，获取和分析数据到在研究旅行期间，我们的合作者及其机构的协助。从电动机及其机构。 另一方面，超导性具有在电力传输和高速运输等多样性的领域的显着进步的希望。 磁性和超导性通常是互斥的，因此对现象共存和竞争的材料的研究对于理解所涉及的基本物理和寻找新型的超导和磁状态很重要。 该项目将通过PI开发的新电容膨胀计（现在在Los Alamos国家实验室，AMES实验室和国家高磁场实验室）开发的新电容膨胀计（现在定期使用）。这些测量值将使我们能够更好地理解这些重要状态，绘制相图以及热力学表征低温阶段之间的过渡的竞争相互作用。来自西方学院（洛杉矶的小型文科学院）的各种才华横溢的学生所吸引的本科生将参与这项工作的各个方面，无论是在我们的校园实验室和研究之旅中与我们的家庭机构的合作者一起工作。 这样，我们的学生将接触到“小”和“大”科学的环境。