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Transport phenomena and electron correlation of the heavy Fermion compounds at very low temperatures

极低温度下重费米子化合物的输运现象和电子关联

基本信息

批准号：
05452052
负责人：
SAKURAI Junji
金额：
$ 4.74万
依托单位：
Toyama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

It was our great pleasure that we were able to buy a dilution refrigirator of He3 and He4 pruduced in France thanks to the delivery of the present grand-in-aid of scientific resaerch (B). This apparatus allows a chamber of the sample for the measurements with a diameter of 38 mm and with a height of 12 cm to go down as low as 50 mK in quite a short time of about 3 hours. The aparatus has no 1 K pot, and makes use of the Joule-Thomson refregiration. It is simple and handy to operate, and is suitable for our group since we have a plenty of samples which we wanted to carry out low temperature measurements. Thus we decided to buy the French type dilution refrigirator rather than the English type which is most prevailing in all over the world. After the deliverance of the apparatus to Toyama University, we found that the RF noise made an important noise in the temperature sensor. We cound overcome this by an installation of a noise filter, and we could luckily attain the lowest temperature of 40 mK,a little lower than our specification. Using this apparatus, we started to measure the electric resistivity of several samples of the present interests including CeNiSn down to 100 mK.We are planning to extend our measurements to the thermoelectric power and the Hall effect and to widen the temperature range of measurement down to 50 mK.

我们很高兴能够购买到法国生产的氦3和氦4稀释制冷机，这要归功于目前科学研究资助项目（B）的交付。该装置允许用于测量的具有38 mm直径和12 cm高度的样品室在约3小时的相当短的时间内下降至低至50 mK。该装置没有1 K罐，并利用焦耳-汤姆逊回流。它操作简单方便，适合我们小组，因为我们有大量的样品，我们想进行低温测量。因此，我们决定购买法国式稀释制冷机，而不是英国式，这是最流行的在世界各地。在将该装置交付给富山大学后，我们发现射频噪声是温度传感器中的一个重要噪声。我们可以通过安装噪声滤波器来克服这一点，并且我们可以幸运地获得40 mK的最低温度，略低于我们的规格。使用该装置，我们开始测量几个样品的电阻率，目前的利益，包括CeNiSn下降到100 mK。我们计划将我们的测量扩展到热电功率和霍尔效应，并扩大测量的温度范围下降到50 mK。