Frozen Superparaelectric State of Local Polar Regions in GdMn2O5 and Gd0.8Ce0.2Mn2O5

Abstract

A comparative study of the dielectric properties and electric polarization of multiferroics GdMn2O5 and Gd0.8Ce0.2Mn2O5 has been carried out in the temperature range from 5 up to 300 K. The polarization properties in the ferroelectric state that forms due to a charge ordering and exchange striction have been studied at T less than 30 K. The properties of the restricted polar phase separation domains formed in the crystals containing ions Mn3+ and Mn4+ have been studied, too. These domains exhibit the electric polarization in the temperature range from 5 K to some temperatures Tf lager than TC. Such a high-temperature polarization is due to the frozen superparaelectric state of the restricted polar domains.

arXiv comment26 pages, 10 figures

References in corpus (4)

• Determination of the intrinsic ferroelectric polarization in orthorhombic HoMnO3
• 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

Cited by in corpus (4)

• Electric Polarization in YCrO3 Induced by Restricted Polar Domains of Magnetic and Structural Natures
• Electric Polarization in ErCrO3 Induced by Restricted Polar Domains
• Effect of Rare-Earth Ions on an Electric Polarization Induced by the Phase Separation Domains in RMn2O5 (R = Er, Tb)
• 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