Direct observation of Josephson self-radiation in Bi2Sr2Ca2Cu3Oy break junctions above 77 K

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Abstract
We have directly observed the Josephson self‐radiation emitted from a Bi2Sr2Ca2Cu3Oy break junction at receiver frequencies fREC=11 and 47 GHz above liquid‐nitrogen temperature. The results on the current‐voltage characteristics, the dV/dI vs I curves, the harmonic Josephson self‐radiation, and the dependence of critical current on microwave self‐radiation power are well interpreted in terms of the current biased resistively shunted junction model. The maximum first‐harmonic self‐radiation powers at receiver frequencies fREC=11 and 47 GHz were P(I) =3×10−13 and P(I)=1×10−13 W at 77 K, respectively.