title: Stabilization of charge ordering in La1/3Sr2/3FeO3-delta by magnetic exchange.
abstract: The magnetic exchange energies in charge ordered La1/3Sr2/3FeO3-delta (LSFO) and its parent compound LaFeO3 (LFO) have been determined by inelastic neutron scattering. In LSFO, the measured ratio of ferromagnetic exchange between Fe3+-Fe5+ pairs (JF) and antiferromagnetic exchange between Fe3+-Fe3+ pairs (JAF) fulfills the criterion for charge ordering driven by magnetic interactions (|JF/JAF|>1). The 30% reduction of JAF as compared to LFO indicates that doped holes are delocalized, and charge ordering occurs without a dominant influence from Coulomb interactions.
authors.affiliation: Dept. of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA and Ames Laboratory, Ames, Iowa 50011, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: McQueeney
authors.forename: J
authors.initials: J
authors.lastname: Ma
authors.forename: S
authors.initials: S
authors.lastname: Chang
authors.forename: J-Q
authors.initials: JQ
authors.lastname: Yan
authors.forename: M
authors.initials: M
authors.lastname: Hehlen
authors.forename: F
authors.initials: F
authors.lastname: Trouw