Multipolar Moments in Pr-based Filled-Skutterudite Compounds with Singlet-Triplet Crystal-Field Levels(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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Low-lying singlet-triplet crystal-field levels are realized in Pr-based filled-skutterudite compounds. The properties of multipolar moments in such systems are studied theoretically to elucidate the microscopic origin of their anomalous ordered states. First, we introduce a proper set of multipoles to express the active degrees of freedom in the singlet-triplet subspace. Then, a group-theoretical classification of multipoles is presented to discuss the nature of mixed order parameters in zero and finite magnetic fields. Using a pseudo-spin representation, we construct a generic form of pair interactions and identify the sources of anisotropy for directions of magnetic field. The interactions and the phase diagram of PrOs_4Sb_<12>, which is a typical singlet-triplet system, are discussed in connection with the T_h symmetry specific to the filled-skutterudite systems.
- 社団法人日本物理学会の論文
- 2004-08-15
著者
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椎名 亮輔
Department Of Physics Tokyo Metropolitan University
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SHINA Ryousuke
Department of Physics, Tokyo Metropolitan University
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Shiina Ryousuke
Department Of Physics Tokyo Metropolitan University
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Shina Ryousuke
Max-planck-institut Fur Chemische Rhysik Fester Stoffe:department Of Physics Tokyo Institute Of Tech
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Shina Ryousuke
Department Of Physics Tokyo Institute Of Technology
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Shiina Ryousuke
Department of Materials Science and Technology, Niigata University, Niigata 950-2181, Japan
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