Fiske steps studied with flux-flow resistance oscillation in a narrow   stack of Bi2Sr2CaCu2O8+d junctions
  We have experimentally investigated the fluxon dynamics in a narrow Bi2Sr2CaCu2O8+d stack with junction length L~1.8 um. 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., static flux-flow region at low bias current level and dynamic Fiske step region at high bias current level. 
S. M. Kim, H. B. Wang, T. Hatano, S. Urayama, S. Kawakami, M. Nagao,   Y. Takano, K. Lee, and T. Yamashita