Low Temperature Scanning Tunneling Microscopy

低温扫描隧道显微镜

• 批准号: 9623448
• 负责人: Alex de Lozanne
• 金额: $ 22.5万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-15 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9623448&HistoricalAwards=false
• 关键词: Low; Temperature; Scanning; Tunneling; Microscopy

w:\awards\awards96\*.doc 9623448 DeLozanne This condensed matter physics project will continue development of a low-temperature, ultra-high-vacuum, scanning tunneling microscope (STM). The STM is used for in-situ cleavage of high-Tc materials. Preliminary STM study of the clean surfaces has revealed novel structural features and an reproducible gap in YBCO materials. The origin of the structural features is uncertain and will be further investigated in this project. The instrument capabilities will be improved to allow a lower base operating temperature, and lower noise. This will expand the range superconducting materials that can be investigated. Of particular interest are measurement of vortex structure and charge density waves in superconductors. This is a fundamental project. The results will be of significance for theories of superconductivity, and may lead to development of new superconducting materials. %%% This project will continue development of a surface structure determination tool, a scanning tunneling microscope (STM), which has unique capabilities. With this instrument it is possible to take a small single crystal of a high-Tc superconductor, cool it to very low temperatures (20 K), cleave the crystal, and study the surface structure with the STM at the low temperature. Preliminary data have revealed unusual structural features in high-Tc materials whose origin is uncertain, but which certainly relevant to mechanisms of high-Tc superconductivity. This project will clarify the nature of the structural properties of several high-Tc materials, and will study the temperature dependence of the phenomena. The instrument will be further developed to allow a lower base temperature, which will increase the range of superconducting materials that can be investigated. This is a fundamental project in condensed matter physics. The results will be of significance for theories of superconductivity, and may lead to development of new superconducting materials. ***

W：\奖项\奖项96 \*。doc 9623448 Delozanne这个冷凝的物理项目将继续开发低温，超高vacuum，扫描隧道显微镜（STM）。 STM用于高-TC材料的原位切割。 对干净表面的初步研究揭示了YBCO材料中新型的结构特征和可再现的差距。 结构特征的起源是不确定的，将在该项目中进一步研究。 仪器功能将得到提高，以允许较低的基础工作温度和较低的噪声。 这将扩大可以研究的范围超导材料。 特别令人感兴趣的是超导体中涡流结构和电荷密度波的测量。这是一个基本项目。 结果对于超导性理论具有重要意义，并可能导致新的超导材料的发展。 %% %%该项目将继续开发表面结构确定工具，即具有独特功能的扫描隧道显微镜（STM）。使用该仪器，可以采用高-TC超导体的小单晶，将其冷却至非常低的温度（20 K），裂开晶体，并在低温下使用STM研究表面结构。 初步数据揭示了高-TC材料的异常结构特征，其起源不确定，但肯定与高-TC超导性机制有关。该项目将阐明几种高-TC材料的结构特性的性质，并将研究现象的温度依赖性。该仪器将进一步开发以允许较低的基础温度，这将增加可以研究的超导材料的范围。 这是凝结物理学的基本项目。结果对于超导性理论具有重要意义，并可能导致新的超导材料的发展。 ***