Fiske steps studied by flux-flow resistance oscillation in a narrow stack of Bi2Sr2CaCu2O8+δ junctions -: art. no. 140504

We have experimentally investigated the fluxon dynamics in a narrow Bi2Sr2CaCu2O8+delta stack with junction length L similar to 1.8 mu m. As an evidence of high-frequency excitation by a collective cavity mode, under an (in-plane) external magnetic field, the current-voltage characteristics show prominent Fiske steps with the corresponding resonance frequencies of 75-305 GHz. Further study of flux-flow resistance oscillation with various c-axis currents clarifies the correlation with Fiske steps by distinguishing two different regions, i.e., the static flux-flow region at low bias current level and dynamic Fiske step region at high bias current level.