Magnetic properties of lanthanoid iron and cobalt phosphides with Zr2Fe12P7 type structure
Magnetic properties of lanthanoid iron and cobalt phosphides with Zr2Fe12P7 type structure
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Zr2Fe12P7型结构镧系铁钴磷化物的磁性能
DOI：
10.1016/0022-3697(89)90448-4
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发表时间：
1989
影响因子：
4
通讯作者：
W. Jeitschko
中科院分区：
文献类型：
--
作者：
M. Reehuis;W. Jeitschko
用法拉第天平测定了25个同类型稀土(Ln)化合物Ln2Fe12P7和Ln2Co12P7在15K和室温下的磁化率。铁化合物的磁性主要由Ln原子的磁性决定，而铁原子基本上不携带磁矩。相反，所有钴化合物的居里温度(对于含三价稀土的化合物)在T_c=142K(Pr2Co12P7)和T_c=160K(Ho2Co12P7)之间都是铁磁性的。每个Co原子的磁矩(由Lu2Fe12P7的磁性确定)为μexp=1.14±0.02μB。Ce2Fe12P7(接近泡利顺磁)和Ce2Co12P7(铁磁性，T_c=48K)中的Ce原子至少是几乎四价的。讨论了这些磷化物的磁性和有序化温度，讨论了这些磷化物的磁矩和La原子在Zr2Fe12P7型结构中的排列情况。稀土元素具有最高磁矩的化合物的居里温度最高。Ce2Fe12P7和Lu2Fe12P7在1.7K以下都不会成为超导。
The magnetic susceptibilities of 25 isotypic lanthanoid (Ln) compounds Ln2Fe12P7and Ln2Co12P7were determined with a Faraday balance between 15 K and room temperature. The magnetism of the iron compounds is dominated by the magnetic properties of the Ln atoms, while the iron atoms essentially carry no magnetic moments. In contrast, all cobalt compounds order ferromagnetically with Curie temperatures (for the compounds with the trivalent lanthanoids) of betweenTc= 142 K (Pr2Co12P7) and Tc= 160 K (Ho2Co12P7). The magnetic moment per Co atom (determined from the magnetic behaviour of Lu2Fe12P7) isμexp= 1.14 ± 0.02μB. The Ce atoms in Ce2Fe12P7(nearly Pauli paramagnetic) and Ce2Co12P7(ferromagnetic,Tc= 48 K) are at least almost tetravalent. The magnetic properties and ordering temperatures of these phosphides are discussed considering the magnetic moments and the arrangement of the lanthanoid atoms in the Zr2Fe12P7type structure. The highest Curie temperatures were observed for those compounds where the lanthanoid atoms have the highest magnetic moments. Neither Ce2Fe12P7nor Lu2Fe12P7become superconducting down to 1.7 K.