Effects of phonon dimensionality in the specific heat of multiwall carbon nanotubes at low temperatures

G. A. JORGE, . BEKERIS, C ACHA, M. M. ESCOBAR, S. GOYANES, D. ZILLI, A. L. CUKIERMAN AND R. J. CANDAL

Journal of Physcics, ConferenceSeries

IOP PUBLISHING LTD

Lugar: New York; Año: 2009 vol. 167 p. 12008 - 12010

1742-6596

We have measured the specifi c heat at constant pressure, Cp, of three different samples of multiwall carbon nanotubes (MWNT). For all samples, Cp departs from a graphitic behavior at T < 120 K. Cp measurements show a temperature threshold from a linear regime for intermediate emperature to a higher-order power law for low temperatures. Moreover, it was found that this crossover only depends on the internal structure of the individual MWNT and not on the spatial order of the MWNT within a bundle