Fluxon resonance steps in stacked intrinsic Josephson junctions of Bi2Sr2CaCu2O8+x single crystals

Abstract

We observed jumps in the low-bias fluxon-flow branch of current-voltage characteristics of serially stacked intrinsic Josephson junctions (IJJs) of Bi2Sr2CaCu2O8+x (Bi-2212) single crystals in the long-junction limit. A stack of IJJs (1.5 pm wide and 17 mum long) was fabricated to be sandwiched between two An electrodes. Measurements were made in relatively high magnetic fields up to 5 T. The jumps can be explained in terms of switching between different Josephson fluxon modes in resonance with the collective plasma oscillation modes, presumably induced by both inductive and capacitive coupling. (C) 2004 Elsevier B.V. All rights reserved.