Abstract
Analysis of previously published data of electrical resistivity and specific heat in SmOs 4 Sb 12 has been made combining with other physical quantities. The results demonstrate that the heavy-fermion state develops gradually in the temperature range of 10–100 K with decreasing temperature and to attain the Fermi-liquid characteristics below ∼2 K. In the same temperature (energy) range of 10–100 K, anomalies appear in several quantities corresponding to the rattling anharmonic ion oscillations and unidentified charge fluctuations, suggesting that such electric charge degrees of freedom are deeply involved in the heavy quasiparticle formation. We discuss a possible scenario in which those electric charge degrees of freedom are deeply involved in the heavy quasiparticle formation, whereby the “magnetic-field insensitive” feature is acquired.
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