DYNAMICAL PROPERTIES OF THE JOSEPHSON MULTITERMINALS IN AN APPLIED MAGNETIC-FIELD

The nonstationary behaviour of a 4-terminal SQUID is investigated. The studied system presents two coupled microbridges (forming the Josephs on multiterminal), one of which is incorporated in a superconducting r ing and the other one is connected with a transport circuit. The macro scopic quantum interference, which takes place in the intersection of two microbridges, leads to nonlinear parametric effects controlled by the external parameters, the applied magnetic flux and the transport c urrent. Within the resistively shunted junction model the dynamical be haviour of the system is described by three coupled nonlinear differen tial equations for the phase differences of the order parameter. The t ime-averaged voltage-current characteristics and the time dependencies of the voltage in the transport circuit and of the induced magnetic f lux in the ring are calculated in the current-biased and the voltage-b iased regimes. The dependence of the voltage on the applied magnetic f lux is obtained for different values of the control current and the se lf-inductance of the ring.