Fiske steps studied with flux-flow resistance oscillation in a narrow stack of Bi2Sr2CaCu2O8+d junctions

TL;DR

This study investigates fluxon dynamics in a narrow Bi2Sr2CaCu2O8+d stack, revealing high-frequency Fiske steps and flux-flow resistance oscillations that elucidate the interplay between static and dynamic flux regimes.

Contribution

It provides new experimental insights into fluxon behavior and resonance phenomena in narrow high-temperature superconductor junction stacks.

Findings

Fiske steps observed at 75-305 GHz frequencies.

Correlation between flux-flow resistance oscillations and Fiske steps.

Identification of static and dynamic flux regimes.

Abstract

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.