Abstract
We calculate the vibrational properties of potassium-doped single-walledcarbon nanotubes within lattice dynamical theory. The results show that thefrequency of high-frequency Raman mode E2g for K5C40 downshiftsto 1553 cm−1, which is in agreement with the value for highly dopedsamples with effective composition KC8. Moreover, the specific heatcurves have a turnover at 22 K, originating from the saturation of K atomsvibrational modes at low energy.
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