Observation of a logarithmic temperature dependence of thermoelectric power in multiwall carbon nanotubes

N. Kang, L. Lu, W. J. Kong, J. S. Hu, W. Yi, Y. P. Wang, D. L. Zhang, Z. W. Pan, S. S. Xie
2003 Physical Review B (Condensed Matter)  
We have investigated the thermoelectric power of millimeter-long aligned multiwall carbon nanotubes down to a temperature of Tϭ1.5 K, and observed an accurate T ln T dependence at low temperatures. This behavior is possibly originated from the repulsive interaction between the electrons in a disordered local environment. Louie, Phys. Rev. Lett. 83, 5098 ͑1999͒. 7 R. Egger, Phys. Rev. Lett. 83, 5547 ͑1999͒. 8 C.L. Kane and M.P.A. Fisher, Phys. Rev. Lett. 68, 1220 ͑1992͒. 9 L. Langer et al.,
more » ... Rev. Lett. 76, 479 ͑1996͒. FIG . 3 . The conductance G of the multiwall carbon nanotube samples as a function of temperature. It crosses from a logarithmiclike law to a powerlike law of the form Ϫln GϳT Ϫ1/2 at low temperatures. The deviation of G from the logarithmic behavior above ϳ100 K is due to the contributions of the high subbands.
doi:10.1103/physrevb.67.033404 fatcat:o5prj2rqmrfzrcy4mhgp2x47v4