Electron-electron interaction in multiwall carbon nanotubes

Abstract

Magnetic susceptibility $\chi$ of pristine and brominated arc-produced sample of multiwall carbon nanotubes was measured from 4.2 to 400 K. An additional contribution $\Delta \chi (T)$ to diamagnetic susceptibility $\chi (T)$ of carbon nanotubes was found at T $<$ 50 K for both samples. It is shown that $\Delta \chi (T)$ are dominated by quantum correction to $\chi$ for interaction electrons (interaction effects-IE). The IE shows a crossover from two-dimensional to three-dimensional at $B$ = 5.5 T. The effective interaction between electrons for interior layers of nanotubes are repulsion and the electron-electron interaction $\lambda$${}_c$ was estimated to be ${\lambda }_c\sim$ 0.26.

10 pages, 7 figures