Stabilization of charge ordering in La1/3Sr2/3FeO3-delta by magnetic exchange.
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.
McQueeney
R J
RJ
Dept. of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA and Ames Laboratory, Ames, Iowa 50011, USA.
Ma
J
J
Chang
S
S
Yan
J-Q
JQ
Hehlen
M
M
Trouw
F
F