No abstract

No abstract

No abstract

A quasiparticle-current-fluctuation contribution to the radiation emitted by Josephson tunnel junctions is calculated. The result is combined with Stephen's result for the paircurrent-fluctuation contribution and compared with experimental line width data for Sn-I-Sn and Pb-I-Pb junctions.

Several years ago, Josephson 1 predicted that an ac super current of frequency v = 2eV/h would exist in a superconductor-insulator-superconductor tunnel junction biased at a voltage V if the insulating layer were sufficiently thin. 2 The first support for this prediction came from experiments which showed that if electromagnetic fields were induced in the insulating layer by an externally applied microwave field, structure appeared in the dc cur rent-voltage (