Highly Correlated Metals and Insulators

高度相关的金属和绝缘体

• 批准号: 8816817
• 负责人: Thomas Rosenbaum
• 金额: $ 32.44万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-05-01 至 1993-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816817&HistoricalAwards=false
• 关键词: Highly; Correlated; Metals; Insulators

Electronic and magnetic interactions in the presence of disorder provide for a wide variety of collective effects at low temperatures. They propose to study: (i) The Mott-Hubbard transition from the antiferromagnetic insulator to the correlated metal, both in the limit where Coulomb interactions alone dominate and where the effects of electron interactions and disorder are comparable. Experiments at milliKelvin temperatures above, below, and at the metal-insulator transition should help deconvulate these competing effects. (ii) The insulating properties of transition metal and rare earth oxides, where a description in terms of both electronic and magnetic glassiness appears to be most appropriate at low temperatures, and (iii) The correlation-enhanced metallic properties and the anisotropic superconducting order in heavy fermion compounds.

在无序存在的情况下，电子和磁场的相互作用在低温下提供了各种集体效应。他们建议研究：(I)从反铁磁绝缘体到相关金属的Mott-Hubbard转变，既有库仑相互作用占主导地位的极限，也有电子相互作用和无序效应相当的极限。在开尔文温度以上、低于和在金属-绝缘体转变处进行的实验应该有助于消除这些相互竞争的影响。(Ii)过渡金属和稀土氧化物的绝缘性能，其中电子和磁性玻璃性的描述在低温下似乎最合适，以及(Iii)重费米子化合物的相关增强金属性能和各向异性超导秩序。