Raman spectra have been studied on two kinds of highly doped fullerides of AxBa3C60 (x=0,3;A=K, Rb) and KxSm2.75C60 (x=0,3.25). It was found that the Raman spectra are essentially identical to each other for all ternary fullerides. The results show a crossover point at the boundary of t1u and t1g bands for the charge-transfer dependence of Raman shift. Particularly, the totally symmetric Ag(2) mode in t1g fullerides cannot be understood by a simple extrapolation from the low-doped t1u fullerides, where the Ag(2) mode follows a characteristic shift of ∼6.3 cm-1 per elementary charge. The present result shows that the Raman spectra of t1g states cannot be explained only by charge transfer.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 1999|
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