US-Federal Republic of Germany Cooperative Research on HeavyFermion Systems

美德合作研究重费米子系统

• 批准号: 8922735
• 负责人: Gregory Stewart
• 金额: $ 0.76万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-01 至 1993-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8922735&HistoricalAwards=false
• 关键词: US; Federal; Republic; Germany; Cooperative

This award supports Professor Gregory R. Stewart of the University of Florida to collaborate in research on the physics of heavy fermion systems with Professor Frank Steglich of the Institute for Nuclear Physics of the Technical University of Darmstadt, Federal Republic of Germany. The collaborating laboratories bring substantially complementary experimental expertise to the proposed study of >superconductivity in fermions. Professor Steglich's group discovered the first heavy fermion >superconductor. They have considerable expertise and collective knowledge in specific heat, critical fields, thermal expansion, and thermopower and in working with very low temperatures (0.050 Kelvin.) The University of Florida group offers substantial strengths in Uranium.Beryllium13 (UBe.13) sample preparation and studies of small mass.specific heat in high magnetic fields. Heavy fermion systems display anomalously large specific heats at low temperatures which, when coupled with their nearness to magnetic behavior, makes the occurrence of superconductivity in these Cesium and Uranium based compounds unexpected. The collaborating research groups will study the nature of the superconducting pairing and the relationship between normal state properties and superconductivity. They will build on their recent breakthrough in understanding the source of the normal state high effective mass in UBe.13, in order to explore possible implications for superconductivity. Advances in understanding heavy fermion electron systems may have long term applications in magnetism and superconductivity based on their unusual properties and their similarities in some respects to high temperature superconductors.

该奖项支持教授格雷戈里R。斯图尔特 佛罗里达大学合作研究 重费米子系统物理学与弗兰克教授 技术核物理研究所的Steglich 德国联邦共和国达姆施塔特大学。 的 合作实验室带来了实质性的互补性 实验专业知识的建议研究 >费米子中的超导性 Steglich教授的小组 发现了第一个重费米子超导体。 他们 在以下方面具有相当的专业知识和集体知识： 比热，临界场，热膨胀， 热电并在极低温度下工作（0.050 开尔文。） 佛罗里达大学集团提供大量 铀铍13（UBe.13）样品制备中的强度 高磁场中小质量比热的研究 领域的 重费米子系统显示出非常大的比 在低温下加热，再加上它们的 接近磁性行为，使发生 这些铯和铀基化合物的超导电性 出乎意料。 合作研究小组将研究 超导配对的性质和 正常态性质和超导性之间的关系。 他们 将建立在他们最近在理解 UBe.13中正常态高有效质量的来源， 以探索超导性的可能含义。 在理解重费米子电子系统方面的进展可能 在磁性和超导性方面具有长期应用 基于它们不同寻常的特性和 高温超导体的一些方面。