title: Meissner effect in superconducting microtraps.
abstract: We report on the realization and characterization of a magnetic microtrap for ultracold atoms near a straight superconducting Nb wire with circular cross section. The trapped atoms are used to probe the magnetic field outside the superconducting wire. The Meissner effect shortens the distance between the trap and the wire, reduces the radial magnetic-field gradients, and lowers the trap depth. Measurements of the trap position reveal a complete exclusion of the magnetic field from the superconducting wire for temperatures lower than 6 K. As the temperature is further increased, the magnetic field partially penetrates the superconducting wire; hence the microtrap position is shifted towards the position expected for a normal-conducting wire.
authors.affiliation: Physikalisches Institut, Eberhard-Karls-Universität Tübingen, CQ Center for Collective Quantum Phenomena and their Applications, Auf der Morgenstelle 14, D-72076 Tübingen, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Cano
authors.forename: B
authors.initials: B
authors.lastname: Kasch
authors.forename: H
authors.initials: H
authors.lastname: Hattermann
authors.forename: R
authors.initials: R
authors.lastname: Kleiner
authors.forename: C
authors.initials: C
authors.lastname: Zimmermann
authors.forename: D
authors.initials: D
authors.lastname: Koelle
authors.forename: J
authors.initials: J
authors.lastname: Fortágh