Vortex-slip transitions in superconducting a−NbGe mesoscopic channels

N. Kokubo; T. G. Sorop; R. Besseling; P. H. Kes

doi:10.1103/PhysRevB.73.224514

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Vortex-slip transitions in superconducting a−NbGe mesoscopic channels

N. Kokubo, T. G. Sorop, R. Besseling, P. H. Kes

DOI 10.1103/PhysRevB.73.224514 · Physical Review B

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Abstract

Intriguing and novel physical aspects related to the vortex flow dynamics have been recently observed in mesoscopic channel devices of a−NbGe with NbN channel edges. In this work we have systematically studied the flow properties of vortices confined in such mesoscopic channels as a function of the magnetic field history, using dc-transport and mode-locking (ML) measurements. As opposed to the field-down situation, in the field-up case a kink anomaly in the dc I−V curves is detected. The mode-locking measurements reveal that this anomaly is, in fact, a flow induced vortex slip transition: by increasing the external drive (either dc or ac) a sudden change occurs from n to n+2 moving vortex rows in the channel. The observed features can be explained in terms of an interplay between field focusing due to screening currents and a change in the predominant pinning mechanism.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NbGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.68	Pressure not reported	unknown
NbN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	11	Pressure not reported	unknown