Fabrication of heteroepitaxial YBa2Cu3O7−x-PrBa2Cu3O7−x-YBa2Cu3O7−x Josephson devices grown by laser deposition

Abstract

We have fabricated Josephson weak links from in situ laser‐deposited four‐layer structures of YBa₂Cu₃O_7−x/PrBa₂Cu₃O_7−x/YBa₂Cu₃O_7−xAu. These devices show superconductor/normal‐metal/superconductor‐like current‐voltage characteristics with good areal scaling of both the critical currents I_c and resistances R_j, with I_cR_j≊3.5 mV. Constant‐voltage current steps observed in response to 84 GHz mm‐wave radiation and modulation of the dc supercurrent in a transverse magnetic field demonstrate that both the ac and dc Josephson effects occur in these devices.