Flux Flow effects induced by a control current in a four terminal Josephson device

We report on the characterisation of a new Josephson device, based on a YBa 2Cu3O7 (YBCO) step edge junction and a control line. The control current is injected into the region close to the GB region through two Au/YBCO contac ts. Feeding the device with a suitable control current, linear branches are observed in the current-voltage characteristic of the step edge junction, in the range 0.5 - 2.5 mV. No similar effects appear when an external magne tic field is applied. The stability of the linear branches and their wide-r ange voltage tunability are such that applications can potentially be devel oped in the field of submillimiter-wave generation and detection.