Experimental low-temperature heat capacity of one-dimensional xenon adsorbate chains in the grooves of carbon c-SWNT bundles

Анотація

The experimental studies of the heat capacity of 1D chains of xenon atoms adsorbed in the outer grooves of bundles of closed single-walled carbon nanotubes C_Xe have been first made at temperature range 2–30 K with the adiabatic calorimeter. The experimental data C_Xe have been compared with theory [A. Šiber, Phys. Rev. B 66, 235414 (2002)]. The experimental and theoretical heat capacity curves are close below 8 K. Above 8 K the experimental curve C_Xe (T) exceeds the theoretical one and excess capacity DC_Xe (T) increases monotonously with temperature. We assume that the DC_Xe (T) caused mainly by the increase of the distance between the neighboring xenon atoms in the chain with increasing temperature.