Coherent Activation of Zero-Field Fiske Modes in Arrays of Josephson Junctions

Details Coherent Activation of Zero-Field Fiske Modes in Arrays of Josephson Junctions Coherent Activation of Zero-Field Fiske Modes in Arrays of Josephson Junctions

2008-11-26

arxiv.org/abs/0811.4317v1

Physics

Condensed Matter

Superconductivity

12 pages and 4 figures

Scientific paper

Series arrays of Josephson junctions show evidence of a mode in which all the junctions oscillate in synchronism on voltage resonances appearing, in zero external magnetic field, at multiples of the fundamental Fiske step spacing. The measurements show that the current amplitude of the resonances increases linearly as their voltages are summed. Investigation of the nature of the coherent mode by magnetic field responses of arrays and isolated juctions reveals that the oscillations take place in a parameter plane region where dc magnetic fields only activate boundary current and flux-quanta dynamics can take place.

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