Large Magnetic Susceptibility Anisotropy of Metallic Carbon Nanotubes

Details Large Magnetic Susceptibility Anisotropy of Metallic Carbon Nanotubes Large Magnetic Susceptibility Anisotropy of Metallic Carbon Nanotubes

2010-01-04

arxiv.org/abs/1001.0524v1

Physical Review Letters 105, 017403 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

Through magnetic linear dichroism spectroscopy, the magnetic susceptibility anisotropy of metallic single-walled carbon nanotubes has been extracted and found to be 2-4 times greater than values for semiconducting single-walled carbon nanotubes. This large anisotropy is consistent with our calculations and can be understood in terms of large orbital paramagnetism of electrons in metallic nanotubes arising from the Aharonov-Bohm-phase-induced gap opening in a parallel field. We also compare our values with previous work for semiconducting nanotubes, which confirm a break from the prediction that the magnetic susceptibility anisotropy increases linearly with the diameter.

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