Metal–Insulator Transition of Filled Skutterudite Compound SmRu4P12
Metal–Insulator Transition of Filled Skutterudite Compound SmRu4P12
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填充方钴矿化合物 SmRu4P12 的金属-绝缘体转变
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
G. Kido
中科院分区：
文献类型：
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作者：
K. Matsuhira;Y. Hinatsu;C. Sekine;Takahiro Togashi;Hiroyuki Maki;I. Shirotani;H. Kitazawa;T. Takamasu;G. Kido
填充方钴矿 SmRu 4 P 12 在 16 K (= T MI ) 附近表现出金属-绝缘体 (M–I) 转变。我们详细测量了M-I转变周围高磁场下的比热C(T)、电阻率ρ(T)和磁化强度M(T)。详细的测量表明，这种 M-I 转变是由两个连续的转变引起的。 C(T)在零场时的单峰随着场的增加而变成双峰。 (-dρ/d T ) 和 d M /d T 在与比热峰几乎相同的位置处表现出两个异常。在零场估计的磁熵达到低于T MI 的R ln 4 。晶体电场（CEF）基态是立方对称的四重态。这表明 SmRu 4 P 12 的 M-I 跃迁与源自 CEF 基态四重奏的轨道排序有关。
Filled skutterudite SmRu 4 P 12 exhibits a metal–insulator (M–I) transition near 16 K (= T MI ). We have measured in detail the specific heat C ( T ), electrical resistivity ρ( T ) and magnetization M ( T ) under high magnetic field around M–I transition. The detailed measurements have revealed that this M–I transition is caused by two successive transitions. The single peak in C ( T ) at zero field changes into a double peak with increasing field. (-dρ/d T ) and d M /d T exhibit two anomalies at almost the same positions as the specific heat peaks. The magnetic entropy estimated at zero field reaches R ln 4 below T MI . The crystalline electric field (CEF) ground state is a quartet in cubic symmetry. It is suggested that the M–I transition of SmRu 4 P 12 is related to an orbital ordering originating from the CEF ground state quartet.