Abstract
AbstractWe report superconducting resistive transition characteristics for array(s) of coupled 4‐Angstrom single wall carbon nanotubes embedded in aluminophosphate‐five zeolite. The transition was observed to initiate at 15 K with a slow resistance decrease switching to a sharp, order of magnitude drop between 7.5 and 6.0 K with strong (anisotropic) magnetic field dependence. Both the sharp resistance drop and its attendant nonlinear IV characteristics are consistent with the manifestations of a Berezinskii–Kosterlitz–Thouless transition that establishes quasi long range order in the plane transverse to the c‐axis of the nanotubes, leading to an inhomogeneous system comprising 3D superconducting regions connected by weak links. Global coherence is established at below 5 K with the appearance of a well‐defined supercurrent gap/low resistance region at 2 K.
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