Microwave X-Band Resonances in Doped Cd2Nb2O7 Monocrystals
S. Waplak, A. Ostrowski, M. Wencka and W. Bednarski
Institute of Molecular Physics Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 PoznaƄ, Poland
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Cadmium pyroniobiate (CNO) is the ferroic material with unusual diffuse phase diagram which includes both relaxor and nanocluster domains. We present the data for CNO crystals with several admixtures of paramagnetic ions studied on X and S microwave bands at zero-external magnetic field and classical EPR conditions. Our results lead to an assertion of a ferroelectric resonance effect due to "electronic ferroelectricity". The data fit well to the Falicov-Kimball theoretical model applicable to strongly-correlated-electron or mixed-valence systems.

DOI: 10.12693/APhysPolA.132.7
PACS numbers: 76.30.Fc, 77.22.Ch, 77.80.B-, 77.84.Ek