Inelastic Light Scattering Studies of Kondo Insulators and Other Low Carrier Density Kondo Systems

Kondo 绝缘体和其他低载流子密度 Kondo 系统的非弹性光散射研究

• 批准号: 9700716
• 负责人: S. Lance Cooper
• 金额: $ 18万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-15 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9700716&HistoricalAwards=false
• 关键词: Inelastic; Light; Scattering; Studies; Kondo

w:\awards\awards96\num.doc 9700716 Cooper This experimental research project focuses on inelastic light (Raman and Brillouin) scattering studies of the electronic, magnetic, and vibrational excitations of Kondo insulators and related low carrier density Kondo systems. The symmetry, anisotropy, and temperature dependencies of spin and charge excitations will be studied to elucidate the unconventional ground and low-lying excited states of Kondo insulators. Studies of the magnetic field and pressure dependencies of the charge and spin excitations will be performed. Finally, studies of the phonon anomalies in Kondo insulators will be carried out to clarify the nature of the strong interaction between charge and phonon degrees of freedom. %%% This research project involves experimental light scattering measurements from "Kondo insulators", a poorly understood class of insulators containing rare earth and actinide elements. These compounds display unusual magnetic and electrical properties, believed to be due to the interaction between tightly bound electrons on the heavy rare earth or actinide elements, and the outer shell electrons from the lighter elements. It is desirable to carefully measure the novel behavior, and, ultimately, to extend the theory of crystalline solids to cover these cases. If this is done the theory can be more confidently applied to the wider range of solids which includes semiconductors, metals and others, which find wide application in technology. Results from this research may include unusual new effects or materials which may find new application in technology. This research project is interdisciplinary in nature and involves both graduate and postgraduate students who will be excellently trained to enter positions in industry, government or education. ***

库珀这个实验研究项目的重点是近藤绝缘体和相关材料的电子，磁性和振动激发的非弹性光（拉曼和布里渊）散射研究。 低载流子密度近藤系统。 的 自旋和电荷激发的对称性、各向异性和温度依赖性将被研究，以阐明近藤绝缘体的非常规基态和低激发态。将进行电荷和自旋激发的磁场和压力依赖性的研究。最后，研究近藤绝缘体中的声子异常，以澄清电荷和声子自由度之间的强相互作用的性质。 本研究项目涉及对“近藤绝缘体”的光散射实验测量，近藤绝缘体是一种含有稀土和锕系元素的绝缘体，人们对其了解甚少。这些化合物显示出不寻常的磁性和电学性质，据信是由于重稀土或锕系元素上的紧密束缚电子与较轻元素的外壳电子之间的相互作用。人们希望仔细测量这种新的行为，并最终扩展结晶固体理论以涵盖这些情况。 如果做到了这一点，这个理论就可以更有把握地应用于更广泛的固体，包括半导体、金属和其他在技术上有广泛应用的固体。这项研究的结果可能包括不寻常的新效果或可能在技术中找到新应用的材料。这个研究项目是跨学科的性质，涉及研究生和研究生谁将得到良好的培训，进入行业，政府或教育职位。 ***