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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.87: Poster

Wednesday, March 29, 2006, 14:30–18:30, P1

Tb magnetism in multiferroic TbMnO₃ — •Jörg Voigt, Jörg Persson, Michael Prager, Yixi Su, and Thomas Brückel — Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich

Recently, there has been a debate on the origin of the ferroelectric transition in the Perowskite TbMnO₃ at 28 K. Some authors attribute the spontaneous polarization to a lock-in transition of the Mn³⁺ moments [1]. Kenzelmann et al. [2] observed an ordered Tb³⁺ magnetic moment at the ferroelectric phase transition by a high resolution single crystal neutron study. However, neutron scattering is not element specific and therefore his interpretation could be doubted. We report on X-ray resonance exchange scattering to probe the Tb magnetic order exclusively and time-of-flight neutron spectroscopy to derive the Tb crystal field level scheme above and below the ferroelectric transition.

[1] Kajimoto et al., PRB 70, 012401 (2004)

[2] Kenzelmann et al., PRL 95, 087206 (2005)