Proximity-induced superconductivity in nanowires: Mini-gap state and differential magnetoresistance oscillations

Details Proximity-induced superconductivity in nanowires: Mini-gap state and differential magnetoresistance oscillations Proximity-induced superconductivity in nanowires: Mini-gap state and differential magnetoresistance oscillations

2009-03-13

arxiv.org/abs/0903.2451v1

Physics

Condensed Matter

Superconductivity

11 pages, 4 figures

Scientific paper

We study proximity-induced superconductivity in gold nanowires as a function of the length of the nanowire, magnetic field, and excitation current. Short nanowires exhibit a sharp superconducting transition, whereas long nanowires show nonzero resistance. At intermediate lengths, however, we observe two sharp transitions; the normal and superconducting regions are separated by what we call the mini-gap phase. Additionally, we detect periodic oscillations in the differential magnetoresistance. We provide a theoretical model for the mini-gap phase as well as the periodic oscillations in terms of the coexistence of proximity-induced superconductivity with a normal region near the center of the wire, created either by temperature or application of a magnetic field.

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