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Superconducting properties of polycrystalline Nb nanowires templated by carbon nanotubes

Andrey Rogachev·Alexey Bezryadin
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Abstract

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 (10^7 A/cm^2) 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 (LAMH) theory of thermally activated phase slips. Quantum phase slips are suppressed.

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Andrey Rogachev, Alexey Bezryadin. 2003-06-18. Superconducting properties of polycrystalline Nb nanowires templated by carbon nanotubes. https://doi.org/10.1063/1.1592313

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