arXiv subjects

A. S. Kotosonov

Publications and source records attributed to A. S. Kotosonov.

2 recordsLinked to original sources

arXiv2014

Local Diamagnetic Susceptibility of Quasi-Two-Dimensional Graphite

A sample of quasi-two-dimensional graphite (QTDG) whose magnetic properties are described within the Dirac fermion model is investigated by the nuclear magnetic resonance (NMR) and scanning tunneling microscopy (STM) techniques. The broad spectrum of the sample points to a large dispersion of crystallite sizes in this system, which is also confirmed by STM data. It is established that the local diamagnetic susceptibility may substantially exceed the average value over the sample and reaches an abnormally high value of $-1.3\times 10^{-4}$ emu/g at $T = 4.2$ K, which is greater than the corresponding value of highly oriented graphite by a factor of four.

cond-mat.mtrl-sci↗

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↗