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Dynamical motions of a guest ion in type-I clathrate compounds have been investigated using Raman scattering. It has been found that the 4th order anharmonic potential is important for the guest ion motion not only for A8Ga16Ge30 (A = Ba, Sr, Eu), but also for A8Ga16Si30-xGex (A = Ba, Sr). The substitution of Ge expands isotropically the cage at 6d-site for Ba8Ga16Si30-xGex, however, anisotropically...
Temperature, pressure, and magnetic field dependence of the Raman scattering spectra of Pr-based filled skutterudites PrFe4P12 and PrOs4Sb12 have been measured. In the insulator phase of PrFe4P12 under a pressure, an additional peak is observed. On the other hand, in the A-phase below T=6.5 K at ambient pressure, no additional peak is observed. By means of a factor group analysis, we have evaluated...
We have measured Raman spectra of La 3 Pd 20 Ge 6 and La 3 Pd 20 Si 6 single crystals from 4K to room temperature. For both crystals, all Raman-active modes have been found without additional modes. Thus, there is no evidence that La atoms locate on off-center positions in the cages. By a comparison with La 3 Pd 20 Si 6 , two...
The guest ion motion has been investigated by Raman scattering for the following caged crystals: La3Pd20X6 (X = Ge, Si), X8Ga16Ge30 (X = Ba, Sr, Eu), and KOs2O6. The observed Raman peaks have been well assigned by the polarization dependence and the first principles calculation. It has been found that the energy of the guest ion anomalously decreases with decreasing temperature for X8Ga16Ge30, La3...
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