Development of a High Magnetic Field Pulsed Nuclear Magnetic Resonance (NMR) System for Materials Research

开发用于材料研究的高磁场脉冲核磁共振 (NMR) 系统

• 批准号: 9413196
• 负责人: W. Gilbert Clark
• 金额: $ 11.54万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-01 至 1996-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9413196&HistoricalAwards=false
• 关键词: Development; Magnetic; Field; Pulsed; Nuclear

Partial support is provided to the University of California- Los Angeles for the development of a novel, compact pulsed nuclear magnetic resonance (NMR) instrument for research in condensed matter science. The new instrument will operate over a broad range of steady magnetic fields that extends up to the highest available. The main parts of the system consist of: (1) A compact, portable, medium-power pulsed NMR spectrometer with frequency coverage up to 2 GHz, (2) a low- helium consumption 9-T superconducting solenoid for experiments at UCLA, and (3) a wide variety of probes to accommodate different magnets and experimental conditions of temperature, NMR frequency, and sample alignment. Experiments below 9 T will be conducted at UCLA. For the higher fields (up to 45 T), the spectrometer will be transported to the laboratories at other institutions that house the high-field magnets. Since many of these magnets do not have the field stability and homogeneity necessary for NMR measurements, correction coils will be added to the probes to overcome these difficulties. The NMR research topics to be investigated with the system include the static and dynamic properties of spin density waves, vortex pinning and dynamics in superconductors, and nanocrystal compounds. A secondary use by UCLA investigators of the 9 T magnet that involves very little liquid helium consumption will be thermal, magnetic and frequency dependent electrical transport investigations of correlated electron systems. In these applications, the field at the sample will be swept by maintaining the magnet in the persistent mode and physically lowering it to move its fringing field past the sample. Aside from studies at UCLA, collaborations will be established with other investigators to use the NMR spectrometer at various high field laboratories.

为加州大学洛杉矶分校提供部分支持，用于开发用于凝聚态科学研究的新型紧凑型脉冲核磁共振 (NMR) 仪器。新仪器将在广泛的稳定磁场范围内运行，最高可达可用的最高磁场范围。该系统的主要部分包括：(1) 一台紧凑、便携式、中等功率脉冲核磁共振波谱仪，频率覆盖范围高达 2 GHz，(2) 一个用于加州大学洛杉矶分校实验的低氦消耗 9-T 超导螺线管，以及(3) 多种探头，以适应不同的磁体和温度、NMR 频率和样品对准的实验条件。 9 T 以下的实验将在加州大学洛杉矶分校进行。对于更高的磁场（高达 45 T），光谱仪将被运送到装有高场磁铁的其他机构的实验室。由于许多磁体不具备 NMR 测量所需的场稳定性和均匀性，因此将在探头中添加校正线圈以克服这些困难。该系统要研究的核磁共振研究主题包括自旋密度波的静态和动态特性、超导体中的涡旋钉扎和动力学以及纳米晶体化合物。 加州大学洛杉矶分校研究人员对 9 T 磁体的第二个用途是相关电子系统的热、磁和频率相关的电传输研究，该磁体几乎不需要液氦消耗。在这些应用中，通过将磁体保持在持续模式并物理降低磁体以将其边缘场移过样品来扫描样品处的场。 除了加州大学洛杉矶分校的研究之外，还将与其他研究人员建立合作，在各个高场实验室使用核磁共振波谱仪。