Physical Properties of Novel 4f electrons in ytterbium-based compounds

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In order to investigate an electronic state in Yb-based compounds with large low-temperature specific heat, we performed NMR measurement in the half-Heusler compound YbPtSb. The characteristics of localized 4f spins were observedat high temperatures. We found that the dynamicalelectronic properties change at around 10 K, which were observed as anomalies in the nuclear spin-lattice relaxation rate and the nuclear spin-spin relaxation rate. However, any anomalies were detected in static properties such as Knight shift and a specific heat. This unusual low-temperature state may be associated with the formation of the small magnetic moment which observed in the magnetically ordered state below 0.4 K.