Coherent mode splitting of microwave-induced fluxons in HgI2-intercalated Bi2Sr2CaCu2O8+delta single crystals

Abstract

The microwave response of small stacks of intrinsic Josephson junctions in HgI2-intercalated Bi2Sr2CaCu2O8-delta single crystals was studied. When irradiated with a microwave of frequencies higher than the junction plasma frequency, the supercurrent branch becomes resistive and splits into multiple subbranches. The number of subbranches turns out to be identical to the number of intrinsic Josephson junctions in the mesa within the experimental error. The behavior of the subbranches fits well the predicted Josephson fluxon dynamics in a strongly coupled stack of junctions.