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

We have fabricated Josephson weak links from in situ laser-deposited four-layer structures of YBa2Cu3O7-x/PrBa2Cu3O7-x/YBa2Cu3O7-xAu. These devices show superconductor/normal-metal/superconductor-like current-voltage characteristics with good areal scaling of both the critical currents Ic and resistances Rj, with IcRj≊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. [ABSTRACT FROM AUTHOR]