Observation of Bifurcations and Hysteresis in Nonlinear NbN Superconducting Microwave Resonators
Baleegh Abdo, Eran Segev, Oleg Shtempluck +1 more
In this paper, we report some extraordinary nonlinear dynamics measured in the resonance curve of NbN superconducting stripline microwave resonators. Among the nonlinearities observed: abrupt 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
arXiv:cond-mat/0501114•IEEE Transactions on Applied Superconductivity•Dec 1, 2006•18 citations