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Ferrielectricity in DyMn_(2)O_(5):A golden touchstone for multiferroicity of RMn_(2)O_(5) family

Journal of Advanced Dielectrics 2015年第2期5卷 29-46页

作者： J.-M.Liu S.Dong Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093P.R.China Department of Physics Southeast UniversityNanjing 211189P.R.China

The RMn_(2)O_(5) manganite compounds represent one class of multiferroic family with magnetic origins,which has been receiving continuous attention in the past *** far,our understanding of the magnetic origins for ferroelectricity in RMn_(2)O_(5) is associated with the nearly collinear antiferromagnetic structure of Mn ions,while the exchange striction.induced ionic displacements are the consequence of the spin frustration *** this scenario may be applied to almost all RMn_(2)O_(5) members,its limitation is either clear:the temperature-dependent behaviors of electric polarization and its responses to external stimuli are seriously materials *** inconsistences raise substantial concern with the state-of-the-art physics of ferroelectricity in RMn_(2)O_(5).In this mini-review,we present our recent experimental results on the roles of the 4f moments from R ions which are intimately coupled with the 3d moments from Mn ***_(2)O_(5) is a golden figure for illustrating these *** is demonstrated that the spin structure accommodates two nearly collinear sublattices which generate respectively two ferroelectric(FE)sublattices,enabling DyMn_(2)O_(5) an emergent ferrielectric(FIE)system rarely identified in magnetically induced *** evidence is presented from several aspects,including FIE-like phenomena and magnetoelectric responses,proposed structural model,and experimental check by nonmagnetic substitutions of the 3d and 4f *** perspectives regarding possible challenges in understanding the multiferroicity of RMn_(2)O_(5) as a generalized scenario are discussed.

关键词： RMn_(2)O_(5) multiferroic ferrielectricity 3d-4f coupling exchange striction.

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