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

G. A. JORGE, V. BEKERIS, C. ACHA, M. M. ESCOBAR, S. GOYANES, D. ZILLI, A. L. CUKIERMAN

Puerto Iguazú

Simposio; XIX SLAFES; 2008

Comité organizador Slafes

We have measured the speci c heat at constant pressure, C p, of three dierent samples of multiwall carbon nanotubes (MWNT). For all samples, C p departs from a graphitic behavior at T < 120 K. C p 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. C p, of three different samples of multiwall carbon nanotubes (MWNT). For all samples, C p departs from a graphitic behavior at T < 120 K. C p 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. C p, of three different samples of multiwall carbon nanotubes (MWNT). For all samples, C p departs from a graphitic behavior at T < 120 K. C p 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.