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

我们非常高兴能够购买到法国生产的He3和He4稀释制冷机，这得益于目前的科研重金(B)的交付。该仪器允许直径为38毫米，高度为12厘米的样品室在大约3小时的相当短的时间内降至50 mK。该仪器没有1k锅，并利用焦耳-汤姆逊制冷。它操作简单方便，适合我们组，因为我们有大量的样品，我们想要进行低温测量。因此，我们决定购买法国式稀释冰箱，而不是世界上最流行的英国式。在仪器送到富山大学后，我们发现射频噪声在温度传感器中是一个重要的噪声。我们可以通过安装噪声过滤器来克服这个问题，幸运的是，我们可以达到40 mK的最低温度，略低于我们的规格。利用该仪器，我们开始测量包括CeNiSn在内的几个目前感兴趣的样品的电阻率至100 mK，并计划将我们的测量扩展到热电功率和霍尔效应，并将测量温度范围扩大到50 mK。

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.