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.
@article{arxiv.0809.1852,
title = {Picovoltmeter for probing vortex dynamics in a single weak-pinning Corbino channel},
author = {T. W. Heitmann and K. Yu and C. Song and M. P. DeFeo and B. L. T. Plourde and M. B. S. Hesselberth and P. H. Kes},
journal= {arXiv preprint arXiv:0809.1852},
year = {2009}
}
Comments
4 pages, 3 figures, submitted to Review of Scientific Instruments