Josephson plasma oscillation of a Bi2Sr2CaCu2Oy intrinsic junction

We report the three different modes of microwave emissions from the quasipa rticle(QP)-injected Bi(2)Sr(2)Ca(2)Cu(2)Oy (BSCCO) intrinsic Josephson junc tions. Three different modes of microwave emissions corresponding to the di fferent branches of hysteretic current-voltage (I-V) characteristics of the intrinsic junction are observed by using a heterodyne technique. In additi on to Josephson emission at low bias voltage, we found the two emissions du e to nonequilibrium effects: an incoherent emission at QP branches and a sh arp coherent emission at the gap edge.