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Investigation of Energy Band Structure and Physical Properties of 45 Electron System

45电子系统能带结构和物理性质研究

基本信息

批准号：
01460033
负责人：
SATO K.
金额：
$ 4.42万
依托单位：
Toyama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
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/en/grant/KAKENHI-PROJECT-01460033/
关键词：
Ce-La-Ni system Lattice constant de Haas van Alphen effect TbAl_2 Pressure effect Specific heat CeNiAl_4 Kondo effect Ce-La-Ni系

项目摘要

1. From the measurement of lattice constant of Ce-La-Ni compounds, it was considered that the ionix state of Ce atom is +3.3.2. Single crystal of CeNi was grown by the Czochralski pulling method and dHvA effect was observed.3. It was found the CeNi compound shows the dense Kondo effect.4. The pressure effect of the ferromagnetic Curie temperature in Tb (A1_<l-x>CO_x)_2, 0 < x < 0.1 was measured by the induction method under hydrostatic pressure. The Curie temperatures of theses compounds increased with increasing pressure and the derivative dTc/dp as a function of cobalt concentration did not change so much compared with that of Gd (A1_<l-x>Co_2)_2.5. The specific heats of the ferromagnetic compounds ErNi, GdNi, and HoNi were measured by means of the adiabatic method in the temperature range 2.2-100 K. The specific heats for these samples showed anomalies corresponding to the magnetic orders.6. It is found that CeNiSn is a dense Kondo compound with an electronic specific heat coefficient 223mJ/mol. K2 above 5.4K.7. It is found that CeNiAl_4 is a new member of the dense-Kondo compounds in the valencefluctuation regime and that CeNiAl_4 is non-magnetic above 1.6K.8. Pr and Nd Heusler compounds have large negative paramagnetic Curie temperatures -19K and -29K, respectively.

1.通过测量Ce-La-Ni化合物的晶格常数，认为Ce原子的ionix态为+3.3.2。采用直拉法生长CeNi单晶，观察dHvA效应。 3．发现CeNi化合物表现出致密的近藤效应。 4．采用静水压感应法测量了Tb(A1_<l-x>CO_x)_2,0<x<0.1中铁磁居里温度的压力效应。这些化合物的居里温度随着压力的增加而增加，并且作为钴浓度函数的导数dTc/dp与Gd(A1_<1-x>Co_2)_2.5相比变化不大。采用绝热法测量了铁磁化合物ErNi、GdNi和HoNi在2.2-100 K温度范围内的比热。这些样品的比热表现出与磁序相对应的异常现象。 6．研究发现CeNiSn是一种致密的近藤化合物，电子比热系数为223mJ/mol。 K2 5.4K.7 以上。研究发现CeNiAl_4是价态涨落区域致密近藤化合物的新成员，并且CeNiAl_4在1.6K.8以上是非磁性的。 Pr 和 Nd Heusler 化合物分别具有较大的负顺磁居里温度 -19K 和 -29K。