Low Temperature Behavior of Rare Earth Compounds of Kondo-Type

由于磁自旋之间的Kondo相互作用和RKKY相互作用的竞争，Ce化合物在低温下表现出各种不同类型的物理性质。作为富山研究低温和磁性的研究小组的成员，我们一直在与法国格勒诺布尔的研究小组合作，该小组在同一领域的著名和活跃的研究工作在世界上享有盛名。富山组制备了几种铈化合物，测量了它们的磁性和热性质，发现了它们的重费米子性质、近藤性质和有趣的磁性。格勒诺布尔小组对这些样品进行了中子实验和极低温测量。富山集团的一大成就是在富山的实验室安装了格勒诺布尔型稀释冰箱。格勒诺布尔式稀释冰箱在日本首次安装。它很容易操作，没有1K的锅，而其他稀释冰箱，例如牛津公司，通常有更多的锅。它最近开始使我们能够测量电阻率和其他性能低至mK范围内的低温。格勒诺布尔集团为我们提供了技术帮助和支持，以消除噪音，精确测量温度，并最大限度地减少在mK范围内具有非常小的冷却功率的稀释冰箱中的热量产生。我们的另一件大事是1996年3月13日至15日在富山举办了“稀土化合物的磁性、电学和热学性质”的日法研讨会。参与人数为31人。其中富山大学和富山县立大学的研究人员有8人，法国的研究人员有10人，他们都非常活跃，并以著名的作品而闻名，从北海道到冲绳，日本其他大学的研究人员有13人，他们在前沿研究方面处于领先地位。每位参加者作20至45分钟的口头发言。讨论热烈而富有成果。这次研讨会是富山和格勒诺布尔密切合作的纪念活动。我们将在今年将研讨会的论文集作为《Journal of Physical Society of Japan》的增刊发表，这将对该领域的工作者有很高的价值。少

Ce compounds demonstrate various and different types of physical properties at low temperature originating from the competition between the Kondo interaction and the RKKY interaction between magnetic spins. We, the member of the research group in Toyama studying low temperature and magnetic properties have been collaborating with the research group in Grenoble in France which is well known in the world for famous and active works studying the same field. Toyama group made several Ce compounds, measured magnetic and thermal properties of them and found the heavy fermion properties, Kondo properties and interesting magnetic properties of them. Grenoble group made neutron experiment and very low temperature measurements on these samples.One of big achievements for Toyama group was an installment of a dilution refrigerator of Grenoble type in our laboratory in Toyama. The dilution refrigerator of Grenoble type was installed for the first time in Japan. It is easy to handle and it has no 1K … More pot which other dilution refrigerator, that of Oxford company for example, usually have. It started recently to enable us to measure electric resistivity and other properties down to low temperature of mK range. Grenoble group provided us technical helps and supports for eliminating the noises, the accurate measurements of temperature and for minimizing the heat production in the dilution refrigerator which has very small cooling power at temperature of mK range.Another big event of us was the organization of a Japan-France seminar on "Magnetic, electrical and thermal properties of rare earth compounds" on March 13th to 15th, 1996, held in Toyama. The number of participants was 31. Among them we count eight research workers in Toyama University and Toyama Prefectural University, ten French research workers, all very active and known for their famous works, and thirteen research workers in other universities in Japan, from Hokkaido to Okinawa, who are leading frontier researches. Every participants made oral speeches for twenty to forty five minutes. Discussions were fruitful and hot. The seminar was an utmost event to commemorate the close cooperation between Toyama and Grenoble. We are going to publish in this year the proceedings of the seminar as a "Supplement of Journal of Physical Society of Japan", which will be of high value for workers in this field. Less