We have observed intrinsic Josephson coupling between CuO 2 double layers of YBa 2 Cu 3 O 72d by direct detection of ac and dc Josephson effects. The crucial points were a reduction of the junction size to the 1 2 mm range and a weakening of the interlayer coupling via oxygen depletion of the CuO chains. As a result we obtained distinct signatures in the I-V characteristics and 11 GHz microwave emission caused by ac Josephson currents. The temperature dependence of the critical current supports the idea of a superconductor-insulator-superconductor interlayer tunneling mechanism.[S0031-9007(96)00808-3]
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