Abstract
We have developed a picovoltmeter using a Nb dc superconducting quantum interference device 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.
Highlights
The dynamics of vortices in confined superconductor geometries has generated much interest in recent years, with studies of both fundamental properties of vortex matter as well as devices based on the motion of vortices
Nanoscale channels for guiding vortices through superconducting films with a minimal influence from pinning have been developed for explorations of vortex melting [1], commensurability [2], mode locking [3], and ratchets [4]. These channels are typically arranged across the width of a superconducting strip, so that the vortices enter the channel at one edge of the strip and exit at the other edge, resulting in edge barriers to the vortex motion through the channels [5, 6, 7]
The Corbino geometry has been used for many studies of vortex matter in different superconductors, including bulk crystals of YBCO [8] and NbSe2 [9]
Summary
Follow this and additional works at: https://surface.syr.edu/phy Part of the Physics Commons. W.; Yu, Kang; Song, C.; DeFeo, M P.; and Plourde, B.L.T., "Picovoltmeter for Probing Vortex Dynamics in a Single Weak-Pinning Corbino Channel" (2008). Picovoltmeter for probing vortex dynamics in a single weak-pinning Corbino channel. 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, eliminating the influence of entry barriers
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