Session V23: Focus Session: Charge/Orbital Ordering in Complex Oxides
11:15 AM–2:15 PM, Thursday, March 13, 2008
Morial Convention Center Room: 215
Sponsoring Units:
DMP GMAG
Chair: Jeff Lynn, National Institute of Standards and Technology
Abstract ID: BAPS.2008.MAR.V23.4
Abstract: V23.00004 : Stabilization of Charge Ordering by Magnetic Exchange
11:51 AM–12:27 PM
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Abstract 
Author:
Robert McQueeney
(Iowa State University/Ames Laboratory)
The magnetic exchange energies in charge ordered La$_{1/3}$Sr$_{2/3}$FeO$_{3}$ (LSFO) and its parent compound LaFeO$_{3}$ (LFO) have been determined by inelastic neutron scattering. In LSFO, the measured ratio of ferromagnetic exchange between Fe$^{3+}$-Fe$^{5+}$ pairs ($J_{F})$ and antiferromagnetic exchange between Fe$^{3+}$-Fe$^{3+}$ pairs ($J_{AF})$ fulfills the criterion for charge ordering driven by magnetic interactions ($J_{F}/J_{AF} \quad >$ 1). The 30{\%} reduction of $J_{AF}$ as compared to LFO indicates that doped holes are delocalized, and charge ordering occurs without a dominant influence from Coulomb interactions.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.V23.4