title: Quantized conductance of a single magnetic atom.
abstract: A single Co atom adsorbed on Cu(111) or on ferromagnetic Co islands is contacted with nonmagnetic W or ferromagnetic Ni tips in a scanning tunneling microscope. When the Co atom bridges two nonmagnetic electrodes a conductance of approximately 2e;{2}/h is found. With two ferromagnetic electrodes a conductance of approximately e;{2}/h is observed.
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Néel
authors.forename: J
authors.initials: J
authors.lastname: Kröger
authors.forename: R
authors.initials: R
authors.lastname: Berndt