Abstract
Previous low-temperature heat capacity measurements down to 2 K give evidence for 1-D quantum confinement of SWNT vibrational modes (J. Hone et al., Science 289 (2000) 1730). We extended the data on the same sample down to 0.1 K. A good fit is obtained up to 4 K with C p=C nT −2+0.043T 0.62+0.035T 3 mJ/gK , where the T −2 term is from nuclear hyperfine interactions in ferromagnetic impurities and the T 3 term originates from intertube coupling in agreement with Hone et al. The origin of the T 0.62 term is unknown. Comparison with the vibrational density of states from inelastic neutron scattering is made.
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