arXiv subjects

O. B. Anikeeva

Publications and source records attributed to O. B. Anikeeva.

2 recordsLinked to original sources

arXiv2006

Electron-electron interaction in carbon nanostructures

The electron-electron interaction in carbon nanostructures was studied. A new method which allows to determine the electron-electron interaction constant $λ_c$ from the analysis of quantum correction to the magnetic susceptibility and the magnetoresistance was developed. Three types of carbon materials: arc-produced multiwalled carbon nanotubes (arc-MWNTs), CVD-produced catalytic multiwalled carbon nanotubes (c-MWNTs) and pyrolytic carbon were used for investigation. We found that $λ_c$=0.2 for arc-MWNTs (before and after bromination treatment); $λ_c$ = 0.1 for pyrolytic graphite; $λ_c >$ 0 for c-MWNTs. We conclude that the curvature of graphene layers in carbon nanostructures leads to the increase of the electron-electron interaction constant $λ_c$.

cond-mat.mtrl-sci↗

arXiv2001

Electron-electron interaction in multiwall carbon nanotubes

Magnetic susceptibility $χ$ of pristine and brominated arc-produced sample of multiwall carbon nanotubes was measured from 4.2 to 400 K. An additional contribution $Δχ(T)$ to diamagnetic susceptibility $χ(T)$ of carbon nanotubes was found at T $<$ 50 K for both samples. It is shown that $Δχ(T)$ are dominated by quantum correction to $χ$ 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 $λ$$_c$ was estimated to be $λ_c\sim $ 0.26.

cond-mat.str-el↗