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Study of Anomalous Metal-Insulator Transition of Filled Skutterudite-Type Compounds

Study of Anomalous Metal-Insulator Transition of Filled Skutterudite-Type Compounds
填充方钴矿型化合物的反常金属-绝缘体转变研究
批准号:
14540318
负责人:
SEKINE Chihiro
金额:
$2.5万
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (C)
财政年份:
2002
资助国家:
日本
项目状态:
已结题
起止时间:
2002 至 2003

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中文摘要
翻译
立方填充Skutterudite结构(Im-3空间群)中的PrRu_4p_<12>和SmRu_4p_<12>分别在62K和16K经历了金属-绝缘体(M-I)相变。对于PrRu_4p&t;12>,各种实验表明M-I相变是非磁性的二级相变。为了阐明M-I转变的机制,我们用电子和同步辐射X射线衍射法研究了T<mI>以下的晶体结构。在T<MI>下观察到超晶格斑点。提出了SMRU_4p<12>的低温相空间群为Pm-3。与PrRu_4p;12>相反,磁化率在T<MI>有明显的异常。我们详细测量了在强磁场下的比热、电阻率和磁化强度。详细的测量表明,M-I相变分两个连续步骤发生。这两个反常在30T以下的场依赖关系表明,两个相继相变是反铁-四极有序和反铁磁有序。
英文摘要
PrRu_4P_<12> and SmRu_4P_<12> crystallized in the cubic filled skutterudite structure (space group Im-3) undergo a metal-insulator (M-I) transition at T_<MI>=62K and 16K, respectively. For PrRu_4P_<12>, various experiments suggest that the M-I transition is non-magnetic one of second order. To clarify the mechanism of the M-I transition, we have studied the crystal structure below T_<MI> using electron and synchrotron radiation X-ray diffraction. The superlattice spots were observed below T_<MI>. It is suggested that the space group of low temperature phase is Pm-3 For SmRu_4P_<12>. magnetic susceptibility clearly shows an anomaly at T_<MI> in contrast to PrRu_4P_<12>. We have measured in detail the specific heat, electrical resistivity and magnetization under high magnetic field. The detailed measurements have revealed that the M-I transition occuers in two successive steps. The field dependence up to 30T of the two anomalies suggests that the two successive transitions are antiferro-quadrupolar ordering and antiferro-magnetic order.
期刊论文(21)
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会议论文
M.Matsunami: "Infrared study on the metal-insulator transition in filled skutterudites RRu_4P_<12> (R=Pr, Sm)"J.Magn.Magn.Mater.. (2004)
M.Matsunami:“填充方钴矿 RRu_4P_<12> (R=Pr, Sm) 中金属-绝缘体转变的红外研究”J.Magn.Magn.Mater.. (2004)
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通讯作者:
C Sekine: "Magnetic phase diagram of filled skutterudite compound SmRu_4P_<12>"Acta Physica Polonica B. 34. 983-986 (2003)
C Sekine:“填充方钴矿化合物SmRu_4P_<12>的磁相图”Acta Physica Polonica B.34.983-986(2003)
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通讯作者:
L.Hao: "Crystal-lattice modulation of the metal-insulator transition system PrRu_4P_<12>"J.Magn.Magn.Mater.. (2004)
L.Hao:“金属-绝缘体过渡体系PrRu_4P_<12>的晶格调制”J.Magn.Magn.Mater.. (2004)
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C.H.Lee: "A study of the crystal structure at low temperature in the metal-insulator transition compound PrRu_4P_<12>"J.Magn.Magn.Mater.. (2004)
C.H.Lee:“金属-绝缘体过渡化合物 PrRu_4P_<12> 低温晶体结构的研究”J.Magn.Magn.Mater.. (2004)
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