Supermatching vortex phases in superconducting thin films with antidot lattices
University of Kentucky, Lexington, KY 40506, USA
2 Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
Accepted: 4 December 1997
We report AC magnetic susceptibility χ and magnetic relaxation measurements on a superconducting () film with an antidot lattice. We find new interstitial vortex phases stablized by collective flux line interactions in a supermatching regime extending well above the saturation field defined by maximal filling of the antidot lattice by flux. Observations of a nonmonotonic field dependence of matching anomalies in χ and a critical depinning angle in relaxation behavior reveal the existence of flux line lattice phases of relatively low stability at certain matching fields.
PACS: 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics / 74.25.Ha – Magnetic properties / 74.76.Db – Other superconducting films
© EDP Sciences, 1998