Abstract

The effect of rare-earth ions (R = Er³⁺, Tb³⁺) with strong spin-orbit coupling on the dielectric properties and the electric polarization induced by local polar phase separation domains in RMn₂O₅ multiferroics has been studied. These parameters is found to be qualitatively distinguished from those studied before in GdMn₂O₅, in which Gd³⁺ ion in the ground ⁸S_7/2 state is weakly bounded with the lattice. It is shown that the properties of the polar phase separation domains, which form in the subsystem of Mn³⁺ and Mn⁴⁺ ions, are substantially dependent on the values of crystal fields, in which these domains exist.

中文翻译：

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稀土离子对RMn 2 O 5（R = Er，Tb）中相分离域引起的电极化的影响

摘要

研究了具有强自旋轨道耦合的稀土离子（R = Er ³⁺，Tb ³⁺）对RMn ₂ O ₅多铁体系中局部极性相分离域引起的介电特性和电极化的影响。发现这些参数与之前在GdMn ₂ O _5中研究的参数在质量上有所区别，在GdMn ₂ O _5中，基态⁸ S _7/2的Gd ³⁺离子与晶格弱结合。结果表明，极性相分离域的性质在Mn ³⁺和Mn ⁴⁺的子系统中形成。 离子基本上取决于其中存在这些畴的晶体场的值。