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The low frequency excitations of C60 chains inserted inside single-walledcarbon nanotubes (SWNTs) have been studied by inelastic neutron scattering(INS) on a high quality sample of peapods. The comparison of theneutron-derived generalized phonon density of states (GDOS) of the peapodssample with that of a raw SWNTs allows the vibrational properties of the C60chains encapsulated in the hollow core of the SWNTs to be probed. Latticedynamical models are used to calculate the GDOS of chains of monomers, dimersand polymers inserted into SWNTs, which are compared to the experimental data.The presence of strong interactions between C60 cages inside the nanotube isclearly demonstrated by an excess of mode density in the frequency range around10 meV. However, the presence of a quasi-elastic signal indicates that some ofthe C60\'s undergo rotational motion. This suggests that peapods are made froma mixture of C60 monomers and C60 n-mer (dimer, trimer ... polymer) structures

physical review. b, condensed matter and materials physics

Low-frequency excitations of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:mn>60</mml:mn></mml:msub></mml:math>chains inserted inside single-walled carbon nanotubes

Low-frequency excitations ofC60chains inserted inside single-walled carbon nanotubes