1D Superconducting behavior in 4-Angstrom carbon nanotube-zeolite composite

We report 4-probe electrical measurements on a sample of 4-Angstrom carbon nanotubes-zeolite composite that exhibit 1D superconducting behavior. The resistance displays a smooth decrease as a function of temperature that is characteristic of the phase slip fluctuation effects, and the differential resistance measured as a function of current shows a quasigap that is characteristic of the fluctuating condensate. Both data sets show very little variation upon the application of a magnetic field, up to 9 Tesla. These behaviors are explainable in terms of the Langer-Ambegaokar-McCumber-Halperin (LAMH) theory of phase slips. We also show and discuss an interesting phenomenon in which a sharp zero current (bias) peak appears in the differential resistance above 3 K.