Stabilization of charge ordering in La(1/3)Sr(2/3)FeO(3-d) by magnetic exchange
Abstract
The magnetic exchange energies in charge ordered La(1/3)Sr(2/3)FeO(3-d) (LSFO) and its parent compound LaFeO(3) (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.
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