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The Study of Fermi Surfaces of the Intermetallic Compounds Between Rare-Earths and Nickel

稀土与镍金属间化合物费米面的研究

基本信息

批准号：
01540284
负责人：
MAEZAWA Kunihiko
金额：
$ 1.09万
依托单位：
Toyama Prefectural University (1990)富山県立大谷短期大学 (1989)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540284/
关键词：
mixed valence material de Haas-van Alphen effect high field magnetoresistance CeNi cerium compound solid-state electro-transport 高磁場磁気低抗 LaNi PrNi ドリ-ス・ファンアルフェン効果

项目摘要

The Fermi surfaces of the CeNi and other rare earth-nickel compounds have been investigated by means of de Haas-van Alphen (dHvA) effect and high field magnetoresistance. CeNi is characterized as a mixed valence material, and the f electron could be considered to strongly hybridize to the conduction electrons and becomes itinerant. We have successfully grown the high quality single crystals by a Czochralski method and a solid-state electro-transport method.As the experimental results, the Fermi surface of LaNi contains two open surfaces elongated along the b- and c-axes. Many dHvA branches with the frequencies ranged from 0.7 MG to 150 MG were found in the fundamental planes. In CeNi, the open orbits exist along the b- and c-axes as same as LaNi. Four dHvA branches have been found along the b-axis and two branches along the a-axis. The cyclotron masses of CeNi are about ten times heavier than those of LaNi. From these results and the comparison with a band calculation, it was concluded that the f electron is itinerant.On the other hand, the behaviors of the magnetoresistance in PrNi and NdNi are different from LaNi and CeNi, because of the absence of an open orbit along the c-axis. Many dHvA branches with the frequencies ranged from 2 MG to 40 MG have been observed in PrNi. The frequencies along the b-axis are 4.3 MG and 1.3 MG and the effective masses are 2.2 m_0 and 1.06 m_0, respectively. These values are the same as that in LaNi. The obvious difference from LaNi is the presence of branches with low frequencies, being centered at the a-axis. This difference from LaNi was discussed based on the effect of a ferromagnetic ordering.

用de Haas-van Alphen（dHvA）效应和高场磁电阻研究了CeNi和其它稀土镍化合物的费米面。CeNi被表征为混合价材料，并且f电子可以被认为与传导电子强烈杂化并且变得巡回。我们用提拉法和固态电输运法成功地生长出了高质量的LaNi单晶，实验结果表明LaNi的费米面具有沿着B轴和c轴延伸的两个开放面。在基底面发现许多dHvA分支，频率范围为0.7 - 150 MG。CeNi和LaNi一样，沿着B轴和c轴存在开轨道。沿着b轴发现四个dHvA分支，沿沿着a轴发现两个分支。CeNi的回旋质量大约是LaNi的10倍。从这些结果以及与能带计算的比较中可以得出f电子是巡游的结论。另一方面，PrNi和NdNi的磁电阻行为与LaNi和CeNi不同，因为沿着c轴沿着不存在开放轨道。在PrNi中观察到许多dHvA分支，频率范围为2 MG至40 MG。沿b轴的频率沿着为4.3 MG和1.3 MG，有效质量分别为2.2 m_0和1.06 m_0。这些值与LaNi中的值相同。与LaNi的明显区别是存在以a轴为中心的低频分支。基于铁磁有序效应讨论了这种与LaNi的差异。