Charge Order in LuFe2O4: Antiferroelectric Ground State and Coupling to Magnetism

TitleCharge Order in LuFe2O4: Antiferroelectric Ground State and Coupling to Magnetism
Publication TypeJournal Article
Year of Publication2008
AuthorsAngst M, Hermann RP, Christianson AD, Lumsden MD, Lee C, Whangbo MH, Kim JW, Ryan PJ, Nagler SE, Tian W, Jin R, Sales BC, Mandrus D
Journal TitlePhysical Review Letters
Volume101
Pages227601
Date PublishedNov
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberISI:000261214400060
Keywordsmultiferroics
Abstract

X- ray scattering by multiferroic LuFe2O4 is reported. Below 320 K, superstructure reflections indicate an incommensurate charge order with propagation close to (1/3 1/3 3/2). The corresponding charge configuration, also found by electronic structure calculations as most stable, contains polar Fe= O double layers with antiferroelectric stacking. Diffuse scattering at 360 K, with (1/3 1/3 0) propagation, indicates ferroelectric short- range correlations between neighboring double layers. The temperature dependence of the incommensuration indicates that charge order and magnetism are coupled.

DOI10.1103/PhysRevLett.101.227601
Alternate JournalPhys. Rev. Lett.