Microwave generation by Josephson vortex motion in stacked high- Tc intrinsic junctions

Abstract

We report the observation of the collective transverse plasma (CTP) modes induced by the Josephson vortex lattice motion and the excitation of corresponding electromagnetic waves in a stack of intrinsic Josephson junctions (IJJs) in Bi 2Sr 2CaCu 2O 8+ x . The existence of the CTP modes was confirmed by observing the sub-branches in the tunneling current–voltage curves of staked junctions in the Josephson vortex-flow region. For a proper bias in the sub-branches, the emission of the electromagnetic waves by the collective vortex resonance motion in a stack of IJJs (the oscillator stack) was examined using another on-chip stack of IJJs (the detector stack). The microwave emission from the oscillator stack and the resulting irradiation onto the detector stack was evidenced by the increase of Josephson vortex-flow voltages in the detector stack.