Synthesis and characterization of multiferroic BiMn${}_7$O${}_{12}$

Abstract

We report on the high pressure synthesis of BiMn${}_7$O${}_{12}$, a manganite displaying a "quadruple perovskite" structure. Structural characterization of single crystal samples shows a distorted and asymmetrical coordination around the Bi atom, due to presence of the $6s^2$ lone pair, resulting in non-centrosymmetric space group Im, leading to a permanent electrical dipole moment and ferroelectric properties. On the other hand, magnetic characterization reveals antiferromagnetic transitions, in agreement with the isostructural compounds, thus evidencing two intrinsic properties that make BiMn${}_7$O${}_{12}$ a promising multiferroic material.

4 pages, 3 figures

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Cited by in corpus (7)

• Multiferroic Properties of CaMn${}_7$O${}_{12}$
• Emergent helical texture of electric dipoles
• Universal magneto-orbital ordering in the divalent $A$-site quadruple perovskite manganites $A$Mn${}_7$O${}_{12}$ ($A$ = Ca, Sr, Cd, and Pb)
• Internal-strain mediated coupling between polar Bi and magnetic Mn ions in the defect-free quadruple-perovskite BiMn${}_3$Mn${}_4$O${}_{12}$
• The magnetic structure and spin-flop transition in the A-site columnar-ordered quadruple perovskite $\mathrm{TmM}{\mathrm{n}}_3{\mathrm{O}}_6$
• Ground-state structure, orbital ordering and metal-insulator transition in double-perovskite PrBaMn2O6
• Competing electronic instabilities in the quadruple perovskite manganite PbMn${}_7$O${}_{12}$