Non-d${}^0$ Electric Dipole in FeO${}_5$ bipyramid: a New Resource for Quantum Paraelectrics, Ferroelectrics and Multiferroics

Abstract

Electric polarization in conventional ferroelectric oxides usually involves nonmagnetic transition-metal ions with an empty d shell (the d${}^0$ rule). Here we unravel a new mechanism for local electric dipoles based on magnetic Fe${}^{3+}$ (3d${}^5$) ion violating the d${}^0$ rule. The competition between the long-range Coulomb interaction and short-range Pauli repulsion in a FeO${}_5$ bipyramid with proper lattice parameters would favor an off-center displacement of Fe${}^{3+}$ that induces a local electric dipole. The manipulation of this kind of non-d${}^0$ electric dipoles opens up a new route for generating unconventional dielectrics, ferroelectrics, and multiferroics. As a prototype example, we show that the non-d${}^0$ electric dipoles in ferrimagnetic hexaferrites (Ba,Sr)Fe${}_{12}$O${}_{19}$ lead to a new family of magnetic quantum paraelectrics.

19 pages, 4 figures

References in corpus (2)

• Engineering multiferroism in CaMnO${}_3$
• Non-$d^0$ Mn-driven ferroelectricity in antiferromagnetic BaMnO${}_3$

Cited by in corpus (8)

• High pressure floating zone growth and structural properties of ferrimagnetic quantum paraelectric BaFe${}_{12}$O${}_{19}$
• Different dielectric, magnetic, and magnetodielectric mechanisms in M-type BaFe12O19 hexaferrite regulated by doping Ga3+ and In3+ cations
• Quantum Phase Transitions in Ba(1-x)CaxFe12O19
• Quantum percolation phase transition and magneto-electric dipole glass in hexagonal ferrites
• Evidence for coexistence of spin-glass and ferrimagnetic phases in BaFe12O19 due to basal plane freezing
• A frustrated antipolar phase analogous to classical spin liquids
• Crystal-Field--Driven Magnetoelectric Coupling in the Non-Kramers Hexaaluminate PrMgAl11O19
• Dielectric, magnetic, and magnetodielectric behaviors of BaFe12O19 hexaferrite modulated by Mn and Ti substitutions