PRANCE, R.J. ... et al., 1999. Nonlinear multilevel dynamics of a coupled SQUID ring-resonator system in the hysteretic regime. Physical Review Letters, 82 (26), pp. 5401 - 5404.
We consider the dynamical behavior of a strongly hysteretic SQUID ring coupled to a radio frequency resonator. By experiment we show that this system can display novel multiple level structures in its rf voltage-current characteristics which are solutions of the nonlinear equations of motion describing the system.