Stabilization of charge ordering in La1/3Sr2/3FeO3-delta by magnetic exchange

TitleStabilization of charge ordering in La1/3Sr2/3FeO3-delta by magnetic exchange
Publication TypeJournal Article
Year of Publication2007
AuthorsMcQueeney RJ, Ma J, Chang S, Yan JQ, Hehlen M, Trouw F
Journal TitlePhysical Review Letters
Volume98
Pages126402
Date PublishedMar
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberISI:000245135400040
KeywordsMIXED-VALENCE, ORTHOFERRITES, oxides, SPIN-WAVES, superconductors, VERWEY TRANSITION
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 (J(F)) and antiferromagnetic exchange between Fe3+-Fe3+ pairs (J(AF)) fulfills the criterion for charge ordering driven by magnetic interactions (|J(F)/J(AF)|> 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.

DOI10.1103/PhysRevLett.98.126402
Alternate JournalPhys. Rev. Lett.