Diamagnetic Susceptibility of Multiwall Carbon Nanotubes with Open and Closed Ends

2006 
The diamagnetic susceptibility of multiwall carbon nanotubes with open and closed ends is measured as a function of temperature between liquid helium and room temperatures. A λ-shaped temperature dependence of magnetic susceptibility is observed at around 40 K, in particular, for the specimen with open ends. Repeating the measurements results in a decrease in the peak height and also in flattening the peak. This implies that alignment of the tube axis in parallel to the magnetic field is responsible for this result. Therefore, the λ-shaped temperature dependence is considered to be characteristic of magnetic susceptibility measured in a field perpendicular to the tube axis.
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