Superconducting properties of polycrystalline Nb nanowires templated by carbon nanotubes
نویسندگان
چکیده
Continuous Nb wires, 7–15 nm in diameter, have been fabricated by sputter-coating single fluorinated carbon nanotubes. Transmission electron microscopy revealed that the wires are polycrystalline, having grain sizes of about 5 nm. The critical current of wires thicker than ;12 nm is very high (10 A/cm) and comparable to the expected depairing current. The resistance versus temperature curves measured down to 0.3 K are well described by the Langer–Ambegaokar– McCumber–Halperin theory of thermally activated phase slips. Quantum phase slips are suppressed. © 2003 American Institute of Physics. @DOI: 10.1063/1.1592313#
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