High-pressure synthesis, electrical and magnetic properties of new filled skutterudites LnOs4P12 (Ln = Eu, Gd, Tb, Dy, Ho, Y)
High-pressure synthesis, electrical and magnetic properties of new filled skutterudites LnOs4P12 (Ln = Eu, Gd, Tb, Dy, Ho, Y)
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DOI：
10.1016/j.materresbull.2003.07.015
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发表时间：
2004-02-02
影响因子：
5.4
通讯作者：
Yagi, T
中科院分区：
文献类型：
--
作者：
Kihou, K;Shirotani, I;Yagi, T
在高温高压条件下合成了新型填充式Skutteudite化合物LnOs（4）P（12）（Ln：Eu，Gd，Tb，Dy，Ho和Y）。在室温下研究了这些化合物的X射线衍射。得到了LnOs（4）P（12）（Ln：镧系元素）的晶格常数与镧系元素（包括Y）原子序数的关系。研究了新型重稀土填充方钴矿的低温电磁性质。EuOs4P12和GdOs4P12分别在15和22 K左右出现铁磁转变。两种化合物的价态对于Eu化合物为+2价，对于Gd化合物为+3价。DyOs_（4P）_（12）在低于2K时没有表现出磁性转变。然而，在10 K附近发现了一个小的电异常。YOs4P12在3K附近表现出超导转变。这种化合物是一种新的超导体。本文讨论了新充填的重镧系LnOs（4）P（12）（Ln：Eu，Gd，Dy和Y）方钴矿的电磁异常。我们还发现了基于GdFe_4P_（12）在22 K附近的磁转变的电异常。(C)2003爱思唯尔有限公司。保留所有权利。
New filled skutteudites LnOs(4)P(12) (Ln: Eu, Gd, Tb, Dy, Ho and Y) have been prepared at high temperatures and at high pressures. X-ray diffraction of these compounds is studied at room temperature. The relationship between lattice constants and atomic numbers of lanthanide (including Y) is obtained for LnOs(4)P(12) (Ln: lanthanide). Electrical and magnetic properties of the new filled skutterudites with heavier lanthanide have been investigated at low temperatures. EuOs4P12 and GdOs4P12 show ferromagnetic transitions at around 15 and 22 K, respectively. The valence states of both compounds are +2 for the Eu compound and +3 for the Gd compound. DyOs4P12 does not show the magnetic transition down to 2 K. However, a small electrical anomaly is found at around 10 K. YOs4P12 exhibits a superconducting transition at around 3 K. This compound is a new superconductor. Electrical and magnetic anomalies of new filled skutterudites with heavier lanthanide LnOs(4)P(12) (Ln: Eu, Gd, Dy and Y) are discussed. We have also found the electrical anomaly based on the magnetic transition at around 22 K for GdFe4P12. (C) 2003 Elsevier Ltd. All rights reserved.