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

JORGE, G. A; BEKERIS VICTORIA,; ACHA, C; ESCOBAR MARIANO,; GOYANES, SILVIA; ZILLI DARIO,; CUKIERMAN A. L; CANDAL, R

Puerto Iguazú, Argentina

Congreso; 19th Latin American Symposium on Solid State Physics. SLAFES XIX.; 2008

We have measured the speci 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 which is related to a dimensional crossover from a linear regime for intermediate temperature to a higher-order power law for low temperatures. Moreover, it was found that dimensional crossover only depends on the internal structure of the individual MWNT and not on the spatial order of the MWNT within a bundle. 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 which is related to a dimensional crossover from a linear regime for intermediate temperature to a higher-order power law for low temperatures. Moreover, it was found that dimensional crossover only depends on the internal structure of the individual MWNT and not on the spatial order of the MWNT within a bundle.