Abstract
The effect of rare-earth ions (R = Er^{3+}, Tb^{3+}) with a strong spin-orbit coupling on the dielectric properties and electric polarization induced by the local polar phase separation domains in RMn_2O_5 multiferroics is studied. A qualitative difference between these parameters and those studied previously in GdMn_2O_5 was discovered, in which the Gd^{3+} ion in the ^8S_{7/2} ground state is weakly coupled to the lattice. It has been shown that the properties of the polar phase separation that arise in the subsystem of Mn^{3+} and Mn^{4+} ions due to the finite probability of electron tunneling between these ions of different valencies substantially depend on the magnitudes of the crystal fields in which these domains are located. Authors on English: B.Kh. Khannanov, E.I. Golovenchits, V.A. Sanina
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