Fluxon modes in stacked HTSC intrinsic Josephson junctions

Abstract

Fluxon modes in stacked Josephson junctions (SJJ's) are studied both theoretically and experimentally. It is shown that the critical current J_c across the stack is multiple valued due to a possibility of having different fluxon configurations (modes), which is in good agreement with experiment on Bi₂Sr₂CaCu₂O_8+x, the temperature and magnetic field dependencies of the critical current were calculated for a stack with nonidentical junctions.