Suppression of electron-electron repulsion and superconductivity in Ultra Small Carbon Nanotubes

Abstract

Recently, ultra-small-diameter Single Wall Nano Tubes with diameter of $\sim 0.4nm$ have been produced and many unusual properties were observed, such as superconductivity, leading to a transition temperature $T_c\sim 15^{o}K$, much larger than that observed in the bundles of larger diameter tubes. By a comparison between two different approaches, we discuss the issue whether a superconducting behavior in these carbon nanotubes can arise by a purely electronic mechanism. The first approach is based on the Luttinger Model while the second one, which emphasizes the role of the lattice and short range interaction, is developed starting from the Hubbard Hamiltonian. By using the latter model we predict a transition temperature of the same order of magnitude as the measured one.

arXiv comment7 pages, 3 figures, to appear in J. Phys.-Cond. Mat

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Cited by in corpus (6)

• Electron coherent and incoherent pairing instabilities in inhomogeneous bipartite and nonbipartite nanoclusters
• Phase separation and electron pairing in repulsive Hubbard clusters
• Electronic screening and correlated superconductivity in carbon nanotubes
• Transport through a double barrier in Large Radius Carbon Nanotubes in the presence of a transverse magnetic field
• Influence of dimensionality on superconductivity in carbon nanotubes
• Magnetic order and superconductivity observed in bundles of Double-Wall Carbon Nanotubes