2009 Volume 78 Issue 12 Pages 124702
A crystalline electric field (CEF) model of localized 4f5 electrons is proposed for understanding intriguing ordering phenomena in SmRu4P12. We take the CEF quartet and doublet (pseudo-sextet) of the Hund’s rule ground state with J=5⁄2, and include intersite interactions between multipoles by the mean-field theory. The model leads to a multipole order with representation Γ5u, and shows the following features: (i) increasing transition temperature TMI with increasing magnetic field; (ii) an anomaly in specific heat and other thermodynamic quantities at lower temperature T\\star, (iii) sharpening of the anomaly at T\\star as the magnetic field increases. These behaviors reproduce salient features observed experimentally in SmRu4P12. Possible mechanisms for spontaneous magnetic moment are discussed.
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