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

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

2008-09-10

arxiv.org/abs/0809.1852v1

Rev. Sci. Instrum. 79, 103906 (2008)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, submitted to Review of Scientific Instruments

Scientific paper

10.1063/1.3000683

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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