Abstract
The microwave emissions from the quasiparticle-injected Bi2Sr2CaCu2Oy (BSCCO) intrinsic Josephson junctions along the c-axis are reported. Using a superheterodyne mixer techinque, three different modes of microwave emissions corresponding to the different branches of the hysteretic I — V characteristics of the intrinsic junction are found. At the low bias voltage range, the conventional Josephson self-emission is observable, whereas, at the high bias voltage range, the two novel microwave emissions due to the nonequilibrium effect are recorded; incoherent broadband emissions and a sharp coherent microwave emission. We interpret these two emissions in terms of Josephson plasma emission.
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