Regensburg 2010 – wissenschaftliches Programm

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SYMR: Symposium Nuclear Magnetic Resonance: from Applications in Condensed-Matter Physics to New Frontiers

SYMR 2: Poster: Nuclear Magnetic Resonance - Frontiers and Applications

SYMR 2.2: Poster

Montag, 22. März 2010, 16:30–18:00, Poster C

EPR and NMR of Multiferroic EuxBa1−xTiO3 — •Nataliya Georgieva1, Andreas Pöppl1, Rolf Böttcher1, Marko Bertmer1, Jürgen Haase1, and Alex Sushkov21Faculty of Physics and Earth Sciences, University of Leipzig, Germany — 2Physics Department, Yale University, New Haven, Connecticut

We are investigating multiferroic EuxBa1−xTiO3 with different Eu2+ concentrations (x = 1, 0.75, 0.5, 0.25) using Electron Paramagnetic Resonance (EPR) and Nuclear Magnetic Resonance (NMR) spectroscopy. The ceramic samples exhibit different magnetic and electric properties, depending on their Eu2+ concentration. The X- and Q-band EPR spectra show almost isotropic exchange-coupled Eu2+ signals. Temperature dependent line broadening effects are observed and differ for various Eu2+ concentrations. 137Ba NMR spectra were recorded using frequency stepped Hahn Echo experiments and preliminary 47Ti/49Ti NMR measurements were recorded. The line width of the central 137Ba nuclear quadrupole transition shows a striking dependence on the Eu2+ concentration.

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