Superconducting properties of polycrystalline Nb nanowires templated by carbon nanotubes

Rogachev, A.; Bezryadin, A.
July 2003
Applied Physics Letters;7/21/2003, Vol. 83 Issue 3, p512
Academic Journal
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[SUP7]A/cm[SUP2]) 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.


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