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Study on the electronic state near Fermi surface in dense Kondo alloys by measurement of optical absorption in for-infrared

通过对红外光吸收测量研究致密近藤合金费米面附近的电子态

基本信息

批准号：
61540243
负责人：
YAMAGUCHI Shigeo
金额：
$ 1.02万
依托单位：
Tokyo Metropoliton University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

The final aim of this project is to measure the optical absorption infar-infrared for the Kondo alloys and to analyze the dynamical properties of the conduction electrons in relation to the kondo effect or the heavy Fermion system. To accomplish this, some technical developments are needed to estimate the optical constants and their dependence on temperature. How the Kondo effect appears in the optical absorption of the conduction electrons in far-infrared has not yet known, so investigation about that problem is one of aims of this project. The work in this project has been mainly devoted to the thechnical developments and and analysis on a dilute Kondo alloy AuV which is an ideal and illustrative substance in contrast with dense Kondo alloys, because Au is the good reference material, and the kondo effect can be separeted from the dependence of optical absorption on the concentration of V. We have constructed a more improved cryostat for meaurement of absolute rate of optical absorption by means of calorimetric method. For analysis of optical absorption of AuV, the optical constants were estimated from the rate of optical absorption, and were compared with the absorption calculated from observed dc-conductivity by using simple Drude formula. It was found that the relaxation time has frequency dependence,and that the spectrum profile can be well explanced by means of a resonant scattering model, It is noticeable that the resonant energy is considerabelly smaller than that equivalent to the Kondo temprature, 300K.

本项目的最终目的是测量近藤合金的近红外光吸收，并分析与近藤效应或重费米子系统有关的传导电子的动力学性质。为了实现这一点，需要一些技术发展来估计光学常数及其对温度的依赖性。近藤效应在远红外传导电子的光吸收中是如何出现的还不清楚，因此对该问题的研究是本项目的目标之一。本项目的工作主要是对稀释的近藤合金AuV进行技术开发和分析，它是一种理想的和说明性的物质，与致密的近藤合金相比，因为Au是很好的参考物质，近藤效应与光吸收对钒浓度的依赖性是可以分开的。我们构造了一个改进的低温恒温器，用于测量光吸收的绝对速率。通过量热法吸收。为了分析AuV的光吸收，从光吸收速率估计的光学常数，并与通过使用简单的Drude公式从观察到的直流电导率计算的吸收进行了比较。结果表明，弛豫时间具有频率依赖性，用共振散射模型可以很好地描述弛豫时间的谱线，共振能量明显小于近藤温度300K的共振能量。