Investigation of ferromagnetic filled skutterudite compound EuFe4As12
Investigation of ferromagnetic filled skutterudite compound EuFe4As12
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铁磁填充方钴矿化合物EuFe4As12的研究
DOI：
10.1088/1742-6596/592/1/012032
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
K. Matsuhira
中科院分区：
文献类型：
--
作者：
C. Sekine;K. Ito;K. Akahira;Y. Kawamura;Y. Chen;H. Gotou;K. Matsuhira
对高压合成的砷基方锰矿化合物EuFe4As12进行了热力学和输运性质的测量。报道了EuFe4As12具有类似铁磁的相变，其相变温度高达152K。为了研究这种相变与磁场的关系，测量了高达8T的磁场下的比热。在0T处，类铁磁相变作为比热峰清晰可见。相变的反常随着磁场的作用而变宽并向更高的温度移动。这种行为与铁磁有序是一致的。此外，超额磁熵还表明[Fe4 As 12]多阴离子有磁性贡献的可能性。我们将从Eu4f矩与铁磁性[Fe4As12]主体晶格相互作用的角度讨论磁序状态。通过热电性能的测量，估算出室温下的无量纲优值系数ZT为0.007。
A variety of thermodynamic and transport measurements were performed on As-based filled skutterudite compound EuFe 4 As 12 prepared under high pressure. EuFe 4 As 12 was reported to exhibit a ferromagnetic-like phase transition with an unexpectedly high transition temperature of 152 K. In order to investigate the field dependence of the transition in the arsenide, specific heat measurements under magnetic fields up to 8 T have been carried out. The ferromagnetic-like transition is clearly visible as a peak of the specific heat at 0 T. The anomaly for the phase transition was found to become broad and shift to higher temperature with applying magnetic field. This behavior is consistent with a ferromagnetic ordering. Furthermore, the excess magnetic entropy suggests a possibility of the magnetic contribution of the [Fe 4 As 12] polyanions. We will discuss the magnetic ordering state from a viewpoint of the interaction of Eu 4f moments with the ferromagnetic [Fe 4 As 12] host lattice. From the measurements of thermoelectric properties, the dimensionless figure of merit ZT was evaluated as 0.007 at room temperature.