Journal
PHYSICAL REVIEW B
Volume 90, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.90.180404
Keywords
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Funding
- Natural Science Foundation of China [11227405, 11374347]
- National Key Basic Research Program of China [2011CB921801]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB07030200]
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Electric polarization in conventional paraelectric/ferroelectric oxides usually involves the displacement of nonmagnetic transition-metal ions with an empty d shell. Here we unravel an unusual mechanism for electric polarization based on the displacement of magnetic Fe3+ (3d(5)) ions. Our simulations suggest that the competition between the long-range Coulomb interaction and short-range Pauli repulsion in a FeO5 bipyramidal unit with proper lattice parameters would favor an off-center displacement of Fe3+, which directly induces a local electric dipole. As a prototype example, we show that the electric dipole of a FeO5 bipyramid in (Ba,Sr)Fe12O19 hexaferrites leads to a different family of magnetic quantum paraelectrics. The manipulation of this unique magnetic-ion-induced displacive electric polarization in a FeO5 bipyramid could open up a promising route to generating unconventional dielectrics, ferroelectrics, and multiferroics.
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