title: Different look at the spin state of Co(3+) ions in a CoO(5) pyramidal coordination.
abstract: Using soft-x-ray absorption spectroscopy at the Co L(2,3) and O K edges, we demonstrate that the Co3+ ions with the CoO5 pyramidal coordination in the layered Sr2CoO3Cl compound are unambiguously in the high spin state. Our result questions the reliability of the spin state assignments made so far for the recently synthesized layered cobalt perovskites and calls for a reexamination of the modeling for the complex and fascinating properties of these new materials.
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany.
authors.forename: Z
authors.initials: Z
authors.lastname: Hu
authors.forename: Hua
authors.initials: H
authors.lastname: Wu
authors.forename: M W
authors.initials: MW
authors.lastname: Haverkort
authors.forename: H H
authors.initials: HH
authors.lastname: Hsieh
authors.forename: H-J
authors.initials: HJ
authors.lastname: Lin
authors.forename: T
authors.initials: T
authors.lastname: Lorenz
authors.forename: J
authors.initials: J
authors.lastname: Baier
authors.forename: A
authors.initials: A
authors.lastname: Reichl
authors.forename: I
authors.initials: I
authors.lastname: Bonn
authors.forename: C
authors.initials: C
authors.lastname: Felser
authors.forename: A
authors.initials: A
authors.lastname: Tanaka
authors.forename: C T
authors.initials: CT
authors.lastname: Chen
authors.forename: L H
authors.initials: LH
authors.lastname: Tjeng