Frustration of Exchange-Striction Ferroelectric Ordering and Growth of Electric Polarization of Phase Separation Domains in R${}_{0.8}$Ce${}_{0.2}$Mn${}_2$O${}_5$ (R = Er, Tb) Solid Solutions

Abstract

The effect of rare-earth ions (R = Er${}_3^{+}$, Tb${}_3^{+}$, and Ce${}_{3.75}^{+}$) on the dielectric properties and the electric polarization induced by local polar phase separation domains in solid solutions of R${}_{0.8}$Ce${}_{0.2}$Mn${}_2$O${}_5$ (R = Er, Tb) multiferroics has been studied. These parameters are found to qualitatively differ from those of initial RMn${}_2$O${}_5$ (R = Er, Tb) crystals studied before. It is shown that the properties of the polar phase separation domains that form in a subsystem of Mn3+ and Mn4+ ions due to a finite probability of tunneling electrons between these ions with different valences are substantially dependent on the values of crystal fields in which these domains exist. A combined influence of Er${}_3^{+}$, Tb${}_3^{+}$, and Ce${}_{3.75}^{+}$ ions is found to substantially change the crystal field in R${}_{0.8}$Ce${}_{0.2}$ Mn${}_2$O${}_5$ (R = Er, Tb) as compared to RMn${}_2$O${}_5$ (R = Er, Tb).

21 pages, 4 figures. arXiv admin note: text overlap with arXiv:2002.05471

References in corpus (5)

• A Neutron diffraction study of multiferroics RMn2O5
• Superparaelectric phase in the ensemble of non-interacting ferroelectric nanoparticles
• Electric polarization induced by phase separation in magnetically ordered and paramagnetic states of RMn2O5 (R=Gd, Bi)
• Magnetic Dynamics of Phase Separation Domains in GdMn2O5 and Gd0.8Ce0.2Mn2O5 Multiferroics
• Effect of Rare-Earth Ions on an Electric Polarization Induced by the Phase Separation Domains in RMn2O5 (R = Er, Tb)

Cited by in corpus (1)

• Effect of the Optical Pumping and Magnetic Field on the States of Phase Separation Domains in Eu_{0.8}Cr_{0.2}Mn_2O_5