Fermi Surface Study of Rare Earth Compounds due to the de Haas-van Alphen effect

稀土金属间化合物表现出多种磁性，如局域f电子、价态涨落、致密近藤和重电子，这取决于导电电子和f电子的杂化程度。在本研究项目中，我们测定了稀土化合物的费米面和回旋质量。首先，我们构建了^3He系统，并结合16-T超导磁体测量了德哈斯-凡。阿尔芬(DHvA)振荡和磁阻。一年半过去了，完成了它。样品空间采用特殊设计，不是不锈钢，而是玻璃环氧(非金属)G10材料，以减少由于约100 Oe的调制场而产生的热加热。DHvA振荡检测系统的灵敏度也得到了提高，是原系统的10-100倍。此外，单晶质量也得到了改善，重电子化合物CeCu2、CeSn3、CeIn3和CeGa2的剩余电阻率变得很小，仅为0.1-0.5 cm。我们相信这些是世界上最好的样品。我们测定了CeB_6，PrB_6，CeCu2，YCu2，CeNi，LaNi，CeSn3和LaSn3，CeIn3和NdCu6的费米表面和回旋质量。其中，我们与富山大学的K.Sato教授和布里斯托尔大学的M.Springford教授进行了合作。CeB_6、PrB_6、CeNi、CeIn_3和NdCu6的费米面与相应的La-化合物相似，而CeCu2和CeSn3的费米面与相应的La-化合物不同。

The rare earth intermetallic compounds demonstrate variety of magnetic properties such as localized f-electron, valence fluctuation, dense Kondo and heavy electron, which are based on the degree of hybridization between conduction electrons and f-electrons. In this research project we have determined the Fermi surface and cyclotron mass of rare earth compounds. First we have constructed the ^3He-system, combined with the 16-T superconducting magnets to measure the de Haas-van. Alphen (dHvA) oscillation and the magnetoresistance. One year and half has passed to complete it. Special design was introduced on the sample space, not made of stainless steel but of glass-epozy(non-metallic) G 10 material to reduce the thermal heating due to the modulation field of about 100 Oe. Sensitivity of the detecting system of the dHvA oscillation was also improved, 10-100 times than the previous system. Moreover, quality of single crystals was improved; the residual resistivity of heavy electron compounds such as CeCu_2, CeSn_3, CeIn_3, and CeGa_2, became so small, 0.1-0.5 .cm. We believe these are the best sample in the world. We have determined the Fermi surfaces and cyclotron masses of CeB_6, PrB_6, CeCu_2, YCu_2, CeNi, LaNi, CeSn_3 and LaSn_3, CeIn_3 an NdCu_6. Among them we have done the cooperative works with Prof. K. Sato, Toyama University and also with Prof. M. Springford, University of Bristol. Fermi surfaces of CeB_6, PrB_6, CeNi CeIn_3 and NdCu_6 are concluded to be similar to those of the corresponding La-compounds, while those of CeCu_2 and CeSn_3 are different from the corresponding La-compounds.