Superconducting transition in Nb nanowires fabricated using focused ion beam

Details Superconducting transition in Nb nanowires fabricated using focused ion beam Superconducting transition in Nb nanowires fabricated using focused ion beam

2010-03-29

arxiv.org/abs/1003.5430v1

Nanotechnology 20 (2009) 465302

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 3 images, 1 table

Scientific paper

10.1088/0957-4484/20/46/465302

Making use of focused Ga-ion beam (FIB) fabrication technology, the evolution with device dimension of the low-temperature electrical properties of Nb nanowires has been examined in a regime where crossover from Josephson-like to insulating behaviour is evident. Resistance-temperature data for devices with a physical width of order 100 nm demonstrate suppression of superconductivity, leading to dissipative behaviour that is shown to be consistent with the activation of phase-slip below Tc. This study suggests that by exploiting the Ga-impurity poisoning introduced by the FIB into the periphery of the nanowire, a central superconducting phase-slip nanowire with sub-10 nm dimensions may be engineered within the core of the nanowire.

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