Magnetic-ion-induced displacive electric polarization in FeO 5 bipyramidal units of (Ba, Sr) Fe 12 O 19 hexaferrites
作者： Shi-Peng Shen , Yi-Sheng Chai , Jun-Zhuang Cong , Pei-Jie Sun , Jun Lu
DOI: 10.1103/PHYSREVB.90.180404
关键词: Dipole 、 Ferroelectricity 、 Condensed matter physics 、 Permittivity 、 Ferrimagnetism 、 Multiferroics 、 Polarization density 、 Materials science 、 Electric dipole moment 、 Dielectric
摘要: Electric polarization in conventional ferroelectric oxides usually involves nonmagnetic transition-metal ions with an empty d shell (the d0 rule). Here we unravel a new mechanism for local electric dipoles based on magnetic Fe3+ (3d5) ion violating the rule (Fig. 1a). The competition between long-range Coulomb interaction and short-range Pauli repulsion FeO 5 bipyramid proper lattice parameters would favor off-center displacement of that induces dipole 1b-e). manipulation this kind non-d0 opens up route generating unconventional dielectrics, ferroelectrics, multiferroics. As prototype example, show ferrimagnetic hexaferrites (Ba, Sr)Fe 12 O 19 lead to family quantum paraelectrics 2).1
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