title: Ring-shaped vortex domain in type-II superconductors.
abstract: We present results of experiments in superconducting niobium and numerical simulations showing the creation of a metastable ring-shaped vortex domain by heating. Such vortex rings, if pinned by structural defects, can exist forever.
authors.affiliation: Grenoble High Magnetic Field Laboratory, Max-Planck-Insitut für Festkörperforschung and Centre National de la Recherche Scientifique, 25 rue des Martyrs, F-38042 Grenoble Cedex 9, France.
authors.forename: A
authors.initials: A
authors.lastname: Gröger
authors.forename: A
authors.initials: A
authors.lastname: Böhm
authors.forename: U
authors.initials: U
authors.lastname: Beyer
authors.forename: B Ya
authors.initials: BY
authors.lastname: Shapiro
authors.forename: I
authors.initials: I
authors.lastname: Shapiro
authors.forename: P
authors.initials: P
authors.lastname: Wyder