Superconductivity in 4 Angstrom Single-Walled Carbon Nanotubes

Magnetic and electrical transport measurements were reproducible on the same sample over a period of a few months, indicating that the nanotubes inside the AFI channels were stable

Z. K. Tang; Lingyun Zhang; N. Wang; X. X. Zhang; G. H. Wen; G. D. Li; J. N. Wang; C. T. Chan; Ping Sheng

2002

Scholarcy highlights

  • The possibility of superconductivity in carbon nanotubes has been predicted, with a transition temperature that increases with decreasing diameter owing to the enhanced electron-phonon interaction
  • Magnetic and electrical transport measurements were reproducible on the same sample over a period of a few months, indicating that the nanotubes inside the AFI channels were stable
  • The anisotropy in the measured magnetic data suggests that the data are unlikely to arise from random magnetic impurities, because such an effect should be isotropic with respect to the field orientation
  • As R diminishes to zero, the 1D system is necessarily insulating in the transverse direction, i.e., there is no circumferential current
  • For polarization transverse to the SWNTs, the sample is transparent to visible light, whereas for polarization parallel to the SWNTs, the sample is opaque. This is an indication that the sample is insulating in the transverse direction
  • That translates into a measured low-temperature gap width of ∼4 meV, which is in good agreement with the BCS formula of 2Δ(0) = 3.6kTco ≈ 4 meV

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