Magnetic Properties of Ensembles of Carbon Nanotubes

Abstract

Magnetic properties of carbon nanotubes (CN's) are studied in a k·p model. In a magnetic field perpendicular to the tube axis, themagnetization is essentially determined by that of a graphite sheet, while it is induced also by the Aharonov-Bohm (AB) effect in aparallel field. The AB effect manifests itself in the magnetic-fieldand temperature dependence of the differential susceptibility even forensembles of CN's having various circumferences and orientations. Themagnetic properties depend also on carrier doping.