Emergent helical texture of electric dipoles

Abstract

Long-range ordering of magnetic dipoles in bulk materials gives rise to a broad range of magnetic structures, from simple collinear ferromagnets and antiferromagnets, to complex magnetic helicoidal textures stabilized by competing exchange interactions. In contrast, in the context of dipolar order in dielectric crystals, only parallel (ferroelectric) and antiparallel (antiferroelectric) collinear alignments of electric dipoles are typically considered. Here, we report an observation of incommensurate helical ordering of electric dipoles by light hole-doping of the quadruple perovskite BiMn7O12. In analogy with magnetism, the electric dipole helicoidal texture is also stabilized by competing instabilities. Specifically, orbital ordering and lone electron pair stereochemical activity compete, giving rise to phase transitions from a non-chiral cubic structure, to an incommensurate electric dipole and orbital helix, via an intermediate density wave.

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• Emergent helical texture of electric dipoles
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• Evolution of magneto-orbital order upon B-site electron doping in Na1-xCaxMn7O12 quadruple perovskite manganites

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• Microscopic Origin of the Electric Dzyaloshinskii-Moriya Interaction
• The anti-symmetric and anisotropic symmetric exchange interactions between electric dipoles in hafnia
• Purely Electronic Chirality without Structural Chirality
• Strain-driven stabilization of a room-temperature chiral multiferroic with coupled ferroaxial and ferroelectric order
• Noncollinear ferrielectricity and hydrogen-induced ferromagnetic polar half-metallicity in MnO${}_3$Cl
• Competing electronic instabilities in the quadruple perovskite manganite PbMn${}_7$O${}_{12}$
• Electric Field Control of Spin Orbit Coupling and Circular Photogalvanic Effect in a True Ferrielectric Crystal
• Noncollinear ferroelectric and screw-type antiferroelectric phases in a metal-free hybrid molecular crystal
• The crystal and magnetic structure of cesium superoxide
• Room-Temperature Noncolinear Ferroelectricity in van der Waals WO${}_2$Cl${}_2$ with a Wide Bandgap