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Ordering and crossover in a pseudo-sextet localized electron model - Possible scenario for SmRuP skutterudite

Journal of the Physical Society of Japan, ISSN: 0031-9015, Vol: 78, Issue: 12
2009
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A crystalline electric field (CEF) model of localized 4f electrons is proposed for understanding intriguing ordering phenomena in SmRuP. 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 Γ, and shows the following features: (i) increasing transition temperature T with increasing magnetic field; (ii) an anomaly in specific heat and other thermodynamic quantities at lower temperature T, (iii) sharpening of the anomaly at T as the magnetic field increases. These behaviors reproduce salient features observed experimentally in SmRuP. Possible mechanisms for spontaneous magnetic moment are discussed. © 2009 The Physical Society of Japan.

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