Abstract
We carried out X-ray absorption spectroscopy, powder diffraction experiment using synchrotron radiation and inelastic X-ray scattering to elucidate Sm atomic and charge dynamics in SmOs 4 Sb 12 . The X-ray absorption spectra demonstrate that SmOs 4 Sb 12 is a Sm valence fluctuation compound. The inelastic X-ray scattering and powder diffraction experiments demonstrate the presence of the anharmonic Sm modes with low energy. We discussed here the correlation between the low-lying Sm modes and Sm valence fluctuation in SmOs 4 Sb 12 .
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