Titel
Vortex Chains and Vortex Jets in MoSi Microbridges
Autor*in
Volodymyr M. Bevz
Physics Department, V. Karazin Kharkiv National University
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Abstract
Superconducting bridges exhibit many properties of a Josephson junction, such as the electromagnetic radiation at overcritical currents I > Ic and steps in the microwave-irradiated current–voltage (I–V ) curves. These Josephson effects stem from the periodic motion of magnetic flux quanta (vortices) in the narrowest region of the bridge. According to the Aslamazov and Larkin (AL) theory, the I–V curve of such a constriction should exhibit voltage kinks each time the number of vortices in the 1D vortex chain is increased by one. However, in the presence of defects and fluctuations, the intervortex repulsion stipulates the formation of a 2D vortex jet, which goes beyond the 1D AL model. Here, by milling one or two slits across a MoSi thin strip, we make vortices to move in a vortex–jet or a vortex–chain fashion, respectively. Unexpectedly, for the strip with a vortex jet, we observe equidistant voltage kinks at transport currents I ≃ 2Ic which are rather far from the assumption of I _ Ic in the AL model. At the moment, we have no explanation for this observation, tending to attribute it to fast relaxation processes in MoSi and looking forward for a comparison with other superconducting materials.
Stichwort
Josephson junctionflux–flow instabilitynanofabricationsuperconductivityvortex matter
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:1953422
Erschienen in
Titel
physica status solidi (RRL) – Rapid Research Letters
ISSN
1862-6254
Erscheinungsdatum
2023
Verlag
Wiley
Projektnummer
I 4889 – Austrian Science Fund (FWF)
Projektnummer
I 6079 – Austrian Science Fund (FWF)
Projektnummer
I 4865 – Austrian Science Fund (FWF)
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Erscheinungsdatum
2023
Zugänglichkeit
Rechteangabe
© 2023 The Authors

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