Picovoltmeter for probing vortex dynamics in a single weak-pinning Corbino channel
T.W. Heitmann (1), K. Yu (1), C. Song (1), M.P. DeFeo (1), B.L.T., Plourde (1), M.B.S. Hesselberth (2), P.H. Kes (2) ((1) Department of Physics,, Syracuse University, Syracuse, (2) Kamerlingh Onnes Laboratorium, Leiden, University, The Netherlands)
TL;DR
This paper introduces a highly sensitive picovoltmeter based on a Nb SQUID to measure vortex flux-flow voltages in a single, edge-free superconducting channel, enabling detailed study of vortex dynamics.
Contribution
The work presents a novel picovoltmeter setup for probing vortex motion in a single weak-pinning superconducting channel with a Corbino geometry, reducing edge effects.
Findings
Successful measurement of vortex flux-flow voltages at picovolt levels.
Demonstration of vortex motion in a circular, edge-free superconducting channel.
Enhanced understanding of vortex dynamics without entry barrier interference.
Abstract
We have developed a picovoltmeter using a Nb dc Superconducting QUantum Interference Device (SQUID) for measuring the flux-flow voltage from a small number of vortices moving through a submicron weak-pinning superconducting channel. We have applied this picovoltmeter to measure the vortex response in a single channel arranged in a circle on a Corbino disk geometry. The circular channel allows the vortices to follow closed orbits without encountering any sample edges, thus eliminating the influence of entry barriers.
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