Observation of a Logarithmic Temperature Dependence of Thermoelectric   Power on Multiwall Carbon Nanotubes
  We have investigated the thermoelectric power (TEP) of millimeter-long aligned multiwall carbon nanotubes down to a temperature of $T$=1.5 K, and observed for the first time an accurate $T {\rm ln} T$ dependence at low temperatures. This behavior is possibly originated from the repulsive interaction between the electrons in a disordered local environment. 
N. Kang, L. Lu, W. J. Kong, J. S. Hu, W. Yi, Y. P. Wang, D. L.Zhang,   Z. W. Pan, and S. S. Xie