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Phonon spectra of CaB 6 and RB 6 (R=Yb, Ce, and Pr) have been investigated by Raman scattering. We found clear spectral difference between divalent cation hexaboride and trivalent one. E g mode shows the doublet spectra for only the divalent crystals of CaB 6 and YbB 6 . The doublet spectra are understood by the two-dimensional charge distribution on B 6...
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