Weak Links, Interfaces and Mechanisms of High Temperature Superconductivity

高温超导的薄弱环节、界面和机制

• 批准号: 9214707
• 负责人: David Larbalestier
• 金额: $ 204.7万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-06-15 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9214707&HistoricalAwards=false
• 关键词: Weak; Links; Interfaces; Mechanisms; Temperature

This award is for the renewal of funding of the Materials Research Group at the University of Wisconsin at Madison on the topic of weak links, interfaces, and mechanisms of high temperature superconductivity. The original award (DMR-8911332) provided funding for a period of forty two months. The research to be performed under this award is a combination of continuation of research started under the original award plus new areas under the same general topic. Research to be continued includes coupled electromagnetic and microstructural characterization of flux-grown yttrium-barium-copper oxide bicrystals, cation-doped bicrystals, doped and undoped single crystals, melt-processed and solid state sintered polycrystals, as well as development of a high-speed position-sensitive atom probe. New programs starting under this award include coupled local electrical and microstructural characterization by patterning of thin-film and bulk-scale superconducting materials, coupled electromagnetic and microstructural characterization of step-edge superconducting junctions, coupled electromagnetic and microstructural characterization of grain boundaries in bismuth-strontium-calcium- copper oxide bicrystals, studies of local intergranular and intragranular compositional variations using the position- sensitive atom probe, characterization of the grain boundaries using high-spatial-resolution electron energy loss spectroscopy, and investigation of the superconducting gap as a function of temperature and location in the Brillouin zone. %%% The research is aimed at understanding why and how grain boundaries limit the transport critical current density of high temperature superconductivity. This is one of the most important problems in high temperature superconductivity. The challenging experimental procedures required for this research have been demonstrated in the first three years of the Materials Research Group. The group is the only one to have performed coupled electromagnetic and microstructural characterization on the same specimen of superconducting material. The issue of critical current density must be solved to achieve the full potential of high temperature superconductivity for national technological competitiveness.

该奖项是为材料的资金更新 位于麦迪逊的威斯康星州大学的研究小组 主题的薄弱环节，接口，和机制的高 温度超导性 原始裁决（DMR-8911332） 提供为期42个月的资助。 研究 根据这项裁决执行的是一个组合的延续 在最初的奖励下开始的研究加上新的领域 相同的一般性主题。 继续进行的研究包括 耦合电磁和微结构表征 助熔剂生长的钇钡铜氧化物双晶体，阳离子掺杂的 双晶体、掺杂和未掺杂的单晶、熔融加工的和 固态烧结多晶体，以及开发一种 高速位置敏感原子探针 新节目开始 根据这项协议，包括耦合当地电力和 通过薄膜图案化的微结构表征， 大规模超导材料，耦合电磁和 阶边超导体的微结构表征 结，耦合电磁和微结构 铋-锶-钙中的晶界表征 氧化铜双晶，局部晶间和晶间的研究， 颗粒内成分变化使用的位置- 高灵敏度原子探针，晶界表征，原子力显微镜 使用高空间分辨率电子能量损失谱， 和研究的超导间隙的函数 布里渊区的温度和位置。 %%% 这项研究的目的是了解为什么和如何粮食 边界限制了高的传输临界电流密度 温度超导性 这是一个最重要的 高温超导的问题。 充满挑战的 这项研究所需的实验程序已经 在材料研究的前三年里， 组 他们是唯一一个 电磁和微结构表征 超导材料的样品。 关键问题 必须解决电流密度，以实现 国家科技部高温超导研究所 竞争力