Phys. Rev. Lett. 98, 126402 (2007) [4 pages]Stabilization of Charge Ordering in La1/3Sr2/3FeO3-δ by Magnetic ExchangeReceived 24 July 2006; published 20 March 2007 The magnetic exchange energies in charge ordered La1/3Sr2/3FeO3-δ (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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.126402
DOI:
10.1103/PhysRevLett.98.126402
PACS:
71.30.+h, 75.30.Ds, 75.30.Et, 78.70.Nx
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