Abstract
NMR Study of Multiferroic Iron Niobate Perovskites K. Kou°il, V. Chlan, H. t¥pankova, R. ezni£ek, V.V. Laguta and I.P. Raevski Charles University in Prague, Faculty of Mathematics and Physics, V Hole2ovi£kach 2, 180 00 Prague 8, Czech Republic Institute of Physics AS CR, Cukrovarnicka 10, 162 00 Prague 6, Czech Republic Institute of Physics, Southern Federal University, Rostov on Don 344090, Russia We present Nb, Pb and Ba NMR study of multiferroic lead iron niobate and barium iron niobate ceramics. We ascribe development of NMR spectra on cooling below room temperature to magnetism of ferric ions close to resonating nuclei and introduce a framework capable of describing key features of the observed temperature induced changes. We show that the ferric ions have much stronger in uence on hyper ne elds at nuclei of large cations in lead compound and estimate strength of interaction of superantiferromagnetic clusters.
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