Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster: Nuclear Magnetic Resonance - Frontiers and Applications

CPP 15.2: Poster

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

EPR and NMR of Multiferroic Eu_xBa_1−xTiO₃ — •Nataliya Georgieva¹, Andreas Pöppl¹, Rolf Böttcher¹, Marko Bertmer¹, Jürgen Haase¹, and Alex Sushkov² — ¹Faculty of Physics and Earth Sciences, University of Leipzig, Germany — ²Physics Department, Yale University, New Haven, Connecticut

We are investigating multiferroic Eu_xBa_1−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.