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Systematic studies of the anomalous changes of physical properties with punictogen elements in ternary rare-earth compounds

三元稀土化合物中紫点元素物理性质异常变化的系统研究

基本信息

批准号：
10640326
负责人：
KASAYA Mitsuo
金额：
$ 2.05万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640326/
关键词：
Crystal field New Material Fermi Surface Anisotropy energy Ceptp CeptAs 希土類化合物磁気異元性新物質 dHVA

项目摘要

The main purpose of the present research was to investigate the punictogen element (X) dependences of physical properties in ternary rare-earth compounds CePtX (X=Sb,As,P,N) and CePdX (X=As,P,N). The another one was to prepare single crystals of EuPdSb and PrPtBi, polycrystals of which show interesting physical properties as reported by us previously.Firstly, we report crystal structures of these compounds.It is found that CePtSb has a LiGaGe-type crystal structure, while CePtAs and CePtP have YPtAs type. As for CePdX, CePdAs has a LiGaGe-type, while CePdP has a BeZrSi-type. Unfortunately, we have not yet succeeded in preparing CePtN and CePdN.Both LiGaGe, YPtAs and BeZrSi have a hexagonal crystal structure and positions of the constituent elements in the unit cell is nearly the same. Therefore, these compounds is a suitable one for systematic investigation of the X dependences of the physical properties.Next, we report physical properties of these compounds.Both CePtAs and CePtP show very strong anisotropy of transport properties. We have also detected signals of the dHvA effect. From the analyses of the signal, it is found that the Fermi surface is of two-dimensional cylindrical shape, in agreement with the transport properties. We have also observed dHvA effect of CePdAs.As for the magnetic properties, it is found that the easy axis of magnetization of CePtX changes from c-axis to c-plane continuously as X changes fm Sb through As to P.EuPdSb has a TiNiSi-type crystal structure and we have succeeded in preparing single crystal. From the detailed studies of specific heat under the magnetic field and high-field magnetization, we obtained T-H phase diagram of EuPdSb. Furthermore, we observed dHvA effect of EuPdSb. This is the first dHvA signal observed in TiNiSi-type crystal structure.

本研究的主要目的是研究刺原元素(X)对三元稀土化合物CePtX （X=Sb,As，P，N）和CePdX （X=As，P，N）物理性质的依赖关系。另一个是制备了EuPdSb和PrPtBi的单晶，我们之前报道的多晶表现出了有趣的物理性质。首先，我们报道了这些化合物的晶体结构。发现CePtSb具有ligage型晶体结构，而CePtAs和CePtP具有YPtAs型晶体结构。CePdX为ligage型，CePdP为bezrsi型。遗憾的是，我们还没有成功制备CePtN和CePdN。LiGaGe、YPtAs和BeZrSi均具有六方晶体结构，且组成元素在单晶胞中的位置几乎相同。因此，这些化合物是系统研究物理性质的X依赖性的合适化合物。接下来，我们报告了这些化合物的物理性质。cepta和CePtP均表现出很强的输运各向异性。我们也检测到了dHvA效应的信号。通过对信号的分析，发现费米表面为二维圆柱形，符合输运性质。我们还观察到CePdAs的dHvA效应。磁性能方面，发现当X从Sb→As→p时，CePtX的易磁化轴从c轴向c平面连续变化，eupdsb具有tini型晶体结构，我们成功制备了单晶。通过对EuPdSb在磁场和强磁场作用下比热的详细研究，得到了EuPdSb的T-H相图。此外，我们还观察到了EuPdSb的dHvA效应。这是在tinisi型晶体结构中首次观察到的dHvA信号。