title: Picovoltmeter for probing vortex dynamics in a single weak-pinning Corbino channel.
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.
authors.affiliation: Department of Physics, Syracuse University, Syracuse, New York 13244-1130, USA.
authors.forename: T W
authors.initials: TW
authors.lastname: Heitmann
authors.forename: K
authors.initials: K
authors.lastname: Yu
authors.forename: C
authors.initials: C
authors.lastname: Song
authors.forename: M P
authors.initials: MP
authors.lastname: DeFeo
authors.forename: B L T
authors.initials: BL
authors.lastname: Plourde
authors.forename: M B S
authors.initials: MB
authors.lastname: Hesselberth
authors.forename: P H
authors.initials: PH
authors.lastname: Kes