Observation of Bifurcations and Hysteresis in Nonlinear NbN Superconducting Microwave Resonators

Details Observation of Bifurcations and Hysteresis in Nonlinear NbN Superconducting Microwave Resonators Observation of Bifurcations and Hysteresis in Nonlinear NbN Superconducting Microwave Resonators

2005-01-06

arxiv.org/abs/cond-mat/0501114v2

IEEE transactions on applied superconductivity, vol. 16, no. 4, p. 1976, December 2006.

Physics

Condensed Matter

Superconductivity

This work has been submitted to the IEEE for possible publication

Scientific paper

10.1109/TASC.2006.881823

In this paper we report some extraordinary nonlinear dynamics measured in the resonance curve of NbN superconducting stripline microwave resonators. Among the nonlinearities observed: aburpt bifurcations in the resonance response at relatively low input powers, asymmetric resonances, multiple jumps within the resonance band, resonance frequency drift, frequency hysteresis, hysteresis loops changing direction and critical coupling phenomenon. Weak links in the NbN grain structure are hypothesized as the source of the nonlinearities.

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