Raman scattering study of CaB6 and YbB6 |
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| Authors: | Norio Ogita Shinji Nagai Fumitoshi Iga Toshiro Akamtsu Masayuki Udagawa |
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| Institution: | a Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi, Hiroshima 739-8521, Japanb Graduate School of Advanced Sciences of Matter, Hiroshima University, Hiroshima 739-8530, Japanc Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japand Department of Physics, Aoyama-Gakuin University, Tokyo 157-8521, Japan |
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| Abstract: | Phonon spectra of CaB6 and RB6 (R=Yb, Ce, and Pr) have been investigated by Raman scattering. We found clear spectral difference between divalent cation hexaboride and trivalent one. Eg mode shows the doublet spectra for only the divalent crystals of CaB6 and YbB6. The doublet spectra are understood by the two-dimensional charge distribution on B6 without lattice distortion. In addition, the scattered intensities of the phonons change at around the ferromagnetic Curie temperature for YbB6 and at T?600 K for CaB6. These are the characteristic temperatures due to the change of the electronic system. |
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| Keywords: | 78 30 &minus j 75 50D 71 20 Nr |
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