Development of a Variable Temperature, High Frequencey NMR System for Materials Research

小行星9704225 该奖项为开发一种新的变温高频核磁共振（NMR）仪器提供支持，该仪器将安装在佛罗里达大学盖恩斯维尔校区正在建造的新物理大楼内。 该器械将能够在室温下在50 mm的透明孔内提供宽范围的磁场（高达8.5 T，均匀性为10-6）。 宽带高频（5至350 MHz）光谱仪将是仪器的组成部分。 将开发各种探针，以使NMR跨越25 mK至400 K的温度。 %%% 这种新仪器将作为一种工具来探测微观电磁相互作用，这对我们理解新的低维磁体（例如Haldronggap和自旋梯材料）和新的磁性系统（例如Kondo绝缘体和磁性/磁性多层膜）至关重要。 特别是，该仪器提供的数据可能无法通过任何其他已知的实验探针获得。 此外，当新的极端磁场、温度和压力似乎是研究的自然延伸时，实验可能会在国家高磁场实验室（NHMFL）继续进行。 该系统（特别是光谱仪）的设计方式将使其与NHMFL在更高频率和磁场下使用的仪器兼容。 该计划的一个重要组成部分是博士后研究员，研究生和本科生的教育和培训。 研究团队的成员接受过各种现代交叉学科领域的培训，包括（但不限于）低温学，电子学，超高真空技术，NMR，宏观和微观表面科学技术以及新的化学合成方案。 当这些初级研究人员离开这个小组时，他们准备去解决未来未知的技术和科学问题。 ***

9704225 Meisel This award provides support to develop a new variable temperature, high-frequency Nuclear Magnetic Resonance (NMR) instrument that will be housed in the new physics building that is being constructed on the Gainesville campus at the University of Florida. The device will have the capability of providing a wide range of magnetic field (up to 8.5 T with 10-6 homogeneity) in a 50 mm clear bore at room temperature. A broadband high frequency (5 to 350 MHz) spectrometer will be an integral part of the instrument. A variety of probes will be developed to allow NMR to span temperatures from 25 mK to 400 K. %%% This new instrument will serve as a tool to probe the microscopic electromagnetic interactions that are fundamental to our understanding of new low dimensional magnets (e.g. Haldane gap and spin-ladder materials) and novel magnetic systems (e.g. Kondo insulators and magnetic/nonmagnetic multilayers). In particular, the data provided by this instrument may not be obtainable by any other known experimental probe. In addition, when new extremes of magnetic field, temperature, and pressure seem to be natural extensions of the research, the experiments may be continued at the National High Magnetic Field Laboratory (NHMFL). The system (especially the spectrometer) is being designed in a manner which will make it compatible with the instrumentation used at the NHMFL at higher frequencies and magnetic fields. An important component of the proposed program is the education and training of postdoctoral fellows, graduate students, and undergraduate students. Members of the researcher team are trained in a variety of modern cross-disciplinary fields, including (but not limited to) cryogenics, electronics, ultra-high vacuum technology, NMR, macroscopic and microscopic surface science techniques, and new chemical synthesis protocols. When the junior researchers leave the group, they are prepared to tackle the heretofore unknown technic al and scientific questions of the future. ***