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arXiv · 0809.1852

Picovoltmeter for probing vortex dynamics in a single weak-pinning Corbino channel

T. W. Heitmann·K. Yu·C. Song·M. P. DeFeo·B. L. T. Plourde·M. B. S. Hesselberth·P. H. Kes
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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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T. W. Heitmann, K. Yu, C. Song, M. P. DeFeo, B. L. T. Plourde, M. B. S. Hesselberth, P. H. Kes. 2008-09-10. Picovoltmeter for probing vortex dynamics in a single weak-pinning Corbino channel. https://doi.org/10.1063/1.3000683

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