On the cryocooler-based cooling of Josephson microchips fabricated from cuprate superconductors for use in voltage standards

Abstract

The features of the cooling of arrays of Josephson junctions fabricated from cuprate superconductors, as well as their interaction with microwave radiation during treatment in a closed-cycle cryocooler, are investigated. Estimation of microchip heating sources is carried out by measuring the current–voltage characteristics (IVCs) of the Josephson junctions. On the developed the developed experimental setup, Shapiro steps with a voltage of about 25 mV are obtained on the IVCs of the structure exposed to microwave radiation at a frequency of 75 GHz.