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

这个实验研究项目的重点是Kondo绝缘体和相关的低载流子密度Kondo系统的电子、磁和振动激励的非弹性光（拉曼和布里渊）散射研究。将研究自旋和电荷激发的对称性、各向异性和温度依赖性，以阐明近田绝缘子的非常规基态和低洼激发态。研究磁场和压力对电荷和自旋激发的依赖关系。最后，将对近藤绝缘子中的声子异常进行研究，以阐明电荷与声子自由度之间强相互作用的本质。该研究项目涉及“近藤绝缘体”的实验光散射测量，这是一种鲜为人知的含有稀土和锕系元素的绝缘体。这些化合物显示出不同寻常的磁性和电学特性，据信是由于重稀土或锕系元素上紧密结合的电子与来自较轻元素的外层电子之间的相互作用。我们希望仔细地测量这种新的行为，并最终扩展结晶固体理论以涵盖这些情况。如果这样做，理论可以更自信地应用于更广泛的固体，包括半导体，金属和其他，在技术上有广泛的应用。这项研究的结果可能包括不寻常的新效果或材料，可能会在技术上找到新的应用。这个研究项目是跨学科的，涉及研究生和研究生，他们将接受良好的培训，进入工业、政府或教育部门的职位。＊＊＊

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. ***