Disorder-induced superconductivity in ropes of carbon nanotubes

B. Bellafi, S. Haddad, S. Charfi-Kaddour
2009 Physical Review B  
We study the interplay between disorder and superconductivity in a rope of metallic carbon nanotubes. Based on the time dependent Ginzburg Landau theory, we derive the superconducting transition temperature T_c taking into account the critical superconducting fluctuations which are expected to be substantially strong in such low dimensional systems. Our results indicate that, contrary to what is expected, T_c increases by increasing the amount of disorder. We argue that this behavior is due to
more » ... he dynamics of the tubes which reduces the drastic effect of the local disorder on superconductivity by enhancing the intertube Josephson tunneling. We also found that T_c is enhanced as the effective dimensionality of the rope increases by increasing the number N of the tubes forming the rope. However, T_c tends to saturate for large values of N, expressing the establishment of a bulk three dimensional (3D) superconducting order.
doi:10.1103/physrevb.80.075401 fatcat:edvx62mgufbbvfvtktcvc5xjby