Evolution of magneto-orbital order upon B-site electron doping in Na1-xCaxMn7O12 quadruple perovskite manganites

Abstract

We present the discovery and refinement by neutron powder diffraction of a new magnetic phase in the Na1-xCaxMn7O12 quadruple perovskite phase diagram, which is the incommensurate analogue of the well-known pseudo-CE phase of the simple perovskite manganites. We demonstrate that incommensurate magnetic order arises in quadruple perovskites due to the exchange interactions between A and B sites. Furthermore, by constructing a simple mean field Heisenberg exchange model that generically describes both simple and quadruple perovskite systems, we show that this new magnetic phase unifies a picture of the interplay between charge, magnetic and orbital ordering across a wide range of compounds.

arXiv commentAccepted for publication in Physical Review Letters

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• Orbital polarons and ferromagnetic insulators in manganites
• Jahn-Teller distortions and charge, orbital and magnetic orders in NaMn7O12
• Universal magneto-orbital ordering in the divalent $A$-site quadruple perovskite manganites $A$Mn${}_7$O${}_{12}$ ($A$ = Ca, Sr, Cd, and Pb)
• Commensurate structural modulation in the charge- and orbitally-ordered phase of the quadruple perovskite (NaMn${}_3$)Mn${}_4$O${}_{12}$

Cited by in corpus (4)

• Emergent helical texture of electric dipoles
• Striping of orbital-order with charge-disorder in optimally doped manganites
• The magnetic structure and spin-flop transition in the A-site columnar-ordered quadruple perovskite $\mathrm{TmM}{\mathrm{n}}_3{\mathrm{O}}_6$
• Unusual effects of magnetic dilution in the ferrimagnetic columnar ordered $\mathrm{S}{\mathrm{m}}_2\mathrm{MnMnM}{\mathrm{n}}_{4-\mathrm{x}}\mathrm{T}{\mathrm{i}}_{\mathrm{x}}{\mathrm{O}}_{12}$ perovskites