Fractional Order Shapiro Steps in Superconducting Nanowires

Details Fractional Order Shapiro Steps in Superconducting Nanowires Fractional Order Shapiro Steps in Superconducting Nanowires

2008-10-09

arxiv.org/abs/0810.1730v1

Physics

Condensed Matter

Superconductivity

8 Pages plus 3 Figures and references. To appear in App. Phys. Lett

Scientific paper

10.1063/1.3012360

We expose superconducting nanowires to microwave radiation in order to study phase lock-in effects in quasi one dimensional superconductors. For sufficiently high microwave powers a resistive branch with Shapiro steps appears in the voltage-current characteristics. At frequencies in the range of 0.9-4 GHz these steps are of integer order only. At higher frequencies steps of 1/2, 1/3, 1/4 and even 1/6 order appear. We numerically model this behavior using a multi-valued current-phase relationship (CPR) for nanowires.

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