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Abstract
We present experimental investigations of collective resonant Josephson fluxon modes in intrinsic Josephson junction stacks realized as long mesa structures on Bi2Sr2CaCu2O8 single crystals. The mesas consisted of three to six intrinsically stacked junctions. They were between 0.6 and 1 μm wide, and their length was between 6 and 8 μm. In external magnetic fields oriented parallel to the layers, the current–voltage characteristics of the 0.5 μm wide mesas exhibited pronounced resonant structures while for the wider structures the resonances were absent or at most weakly developed. We analyse our results in terms of one-dimensional coupled sine-Gordon equations describing the dynamics of stacked Josephson junctions.
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