Abstract
AbstractA comparative study of the dielectric properties and electric polarization of multiferroics GdMn_2O_5 and Gd_0.8Ce_0.2MnO_5 has been carried out in the temperature range 5–330 K. The polarization properties in the ferroelectric state that forms due to a charge ordering and exchange striction have been studied at T ≤ T _C = 30 K. The properties of the restricted polar phase separation domains formed in the crystals containing ions Mn^3+ and Mn^4+ have been studied, too. These domains exhibit the electric polarization in the temperature range from 5 K to some temperatures T _f ≫ T _C. Such a high-temperature polarization is due to the frozen superparaelectric state of the restricted polar domains.
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