Strong coupling between the spin polarization of Mn and Tb in multiferroic TbMnO3 determined by x-ray resonance exchange scattering

TitleStrong coupling between the spin polarization of Mn and Tb in multiferroic TbMnO3 determined by x-ray resonance exchange scattering
Publication TypeJournal Article
Year of Publication2007
AuthorsVoigt J, Persson J, Kim JW, Bihlmayer G, Bruckel T
Journal TitlePhysical Review B
Volume76
Pages104431
Date PublishedSep
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000249786300076
Keywordsdependence, MAGNETIC SCATTERING
Abstract

We report on an x-ray resonance exchange scattering (XRES) study of multiferroic TbMnO3. Magnetic scattering is observed close to the Mn K edge and the Tb L-III and L-II edges. Surprisingly, Tb shows XRES also in the paraelectric phase, where neutron diffraction results suggested the 4f moments to be disordered. The temperature dependence of the XRES intensities shows a distinct kink close to the ferroelectric transition temperature T-C for all absorption edges. We were able to model the temperature dependence for all edges, assuming a strong coupling of Mn and Tb magnetism via the spin polarized 5d conduction band. We argue that the hybridization between Mn and Tb states is a prerequisite for the multiferroic effect in this material.

DOI10.1103/PhysRevB.76.104431
Alternate JournalPhys. Rev. B