Single Phase Slip Limited Switching Current in 1-Dimensional Superconducting Al Nanowires

Details Single Phase Slip Limited Switching Current in 1-Dimensional Superconducting Al Nanowires Single Phase Slip Limited Switching Current in 1-Dimensional Superconducting Al Nanowires

2010-06-02

arxiv.org/abs/1006.0420v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, submitted to Physical Review Letters

Scientific paper

An Aluminum nanowire switches from superconducting to normal as the current is increased in an upsweep. The switching current (I_s) averaged over upsweeps approximately follows the depairing critical current (I_c) but falls below it. Fluctuations in I_s exhibit three distinct regions of behaviors and are non-monotonic in temperature: saturation well below the critical temperature T_c, an increase as T^{2/3} at intermediate temperatures, and a rapid decrease close to T_c. Heat dissipation analysis indicates that a single phase slip is able to trigger switching at low and intermediate temperatures, whereby the T^{2/3} dependence arises from the thermal activation of a phase slip, while saturation at low temperatures provides striking evidence that the phase slips by macroscopic quantum tunneling.

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