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、致密近藤和重电子等，这些磁性是基于传导电子和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，我们建立了^3 He-系统，结合16 T超导磁体测量了de哈斯-货车。Alphen（dHvA）振荡和磁电阻。经过一年半的时间完成，样品空间采用玻璃-环氧树脂（非金属）G 10材料，而非不锈钢材料，减少了100 Oe左右的调制场引起的热效应，dHvA振荡探测系统的灵敏度也提高了10-100倍。此外，单晶质量得到改善，重电子化合物如CeCu_2、CeSn_3、CeIn_3和CeGa_2的剩余电阻率变得非常小，为0.1- 0.5cm。我们相信这是世界上最好的样品。我们测定了CeB_6，PrB_6，CeCu_2，YCu_2，CeNi，LaNi，CeSn_3和LaSn_3，CeIn_3，NdCu_6的费米面和回旋质量。其中与K.佐藤，富山大学，并与M。布里斯托大学斯普林福德分校。CeB_6、PrB_6、CeNi、CeIn_3和NdCu_6的费米面与相应的La化合物的费米面相似，而CeCu_2和CeSn_3的费米面与相应的La化合物的费米面不同。

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.