Abstract
The effect of rare-earth ions (R = Er3+, Tb3+, and Ce3.75+) on the dielectric properties and the electric polarization induced by local polar phase separation domains in solid solutions of R0.8Ce0.2Mn2O5 (R = Er, Tb) multiferroics has been studied. These parameters are found to qualitatively differ from those of initial RMn2O5 (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 Er3+, Tb3+, and Ce3.75+ ions is found to substantially change the crystal field in R0.8Ce0.2Mn2O5 (R = Er, Tb) as compared to RMn2O5 (R = Er, Tb).
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ACKNOWLEDGMENTS
This work was supported in part by the Russian Foundation for Basic Research (projects 18-32-00241 and 20-02-00667) and program 1.4 of the Presidium of the Russian Academy of Sciences “Topical problems of the low-temperature physics.”
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Translated by Yu. Ryzhkov
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Khannanov, B.K., Golovenchits, E.I. & Sanina, V.A. Frustration of Exchange-Striction Ferroelectric Ordering and Growth of Electric Polarization of Phase Separation Domains in R0.8Ce0.2Mn2O5 (R = Er, Tb) Solid Solutions. Phys. Solid State 62, 660–669 (2020). https://doi.org/10.1134/S1063783420040125
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DOI: https://doi.org/10.1134/S1063783420040125