Field-Induced Multipole States of Sm-Based Filled Skutterudites(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We discuss microscopic aspects of multipole properties of Sm-based filled skutterudite compounds under a magnetic field by analyzing a seven-orbital Anderson model with the use of a numerical renormalization group method. In order to determine the multipole state, we evaluate the susceptibility for the multipole operator defined in the form of one-body spin-charge density by the Wigner-Eckart theorem. We show our numerical results on entropy, specific heat, and multipole susceptibility of the seven-orbital Anderson model for the case of five f electrons at an impurity site under an applied magnetic field. Here we consider three directions of the magnetic field as [0,0,1], [1,1,0], and [1,1,1]. For all directions, dipoles and higher-rank multipoles with the same Γ_<4u> symmetry are induced, but depending on the direction of the magnetic field, characteristic multipoles are found to be additionally induced. For the [1,1,1] direction, we observe that Γ_<2u> octupole moment is induced, while for [0,0,1] and [1,1,0] directions, Γ_<3g> quadrupole moments are found to be induced. Note that only for [0,0,1], Γ_<5u> octupole is found to dominate dipole and Γ_<4u> octupole. For each direction of the magnetic field, we depict a phase diagram deduced from specific heat and multipole susceptibility. Then, we discuss possible relevance of the present results with experimental ones on Sm-based filled skutterudites. Since higher-rank multipoles do not directly couple with the magnetic field, in general, the multipole Kondo effect is not so sensitive to the magnetic field, which may lead to a basic concept to understand magnetically robust heavy fermion phenomenon.
- 社団法人日本物理学会の論文
- 2008-07-15
著者
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Hotta Takashi
Department Of Physics Tokyo Metropolitan University
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Hotta Takashi
Department Of Neurological Surgery Sapporo Medical College And Hospital
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