Response of YBCO/PBCO/YBCO ramp type Josephson junctions to near mm wave irradiation

Abstract

A high T¢ Josephson device for high frequency detection applications is being developed, consisting of an Y13CO/P13CO/Y13CO ramp type junction and a broad band log-periodic antenna. In this contribution we present the response of such a device to (near) mm wave irradiation. Shapiro steps have been observed up to very high voltage values -nearly 4 mV at 10 K, at the maximum of the radiation power. The modulation of the step amplitudes shows very good resemblence with the predictions from the Resistively Shunted Junction model.