Evolution of Magneto-Orbital order Upon B-Site Electron Doping in Na1−xCaxMn7O12 Quadruple Perovskite Manganites

ORAL

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.

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Presenters

  • Roger Johnson

    University of Oxford, ISIS Pulsed Neutron Source, Rutherford Appleton Laboratory, Clarendon Laboratory, University of Oxford, Department of Physics, University of Oxford, Physics, University of Oxford

Authors

  • Roger Johnson

    University of Oxford, ISIS Pulsed Neutron Source, Rutherford Appleton Laboratory, Clarendon Laboratory, University of Oxford, Department of Physics, University of Oxford, Physics, University of Oxford

  • Francesco Mezzadri

    Istituto dei Materiali per Elettronica e Magnetismo

  • Pascal Manuel

    ISIS Pulsed Neutron Source, Rutherford Appleton Laboratory, ISIS Facility, STFC

  • Dmitry Khalyavin

    ISIS Neutron and Muon Source Science and Technology Facilities Council, ISIS, Rutherford Appleton Laboratory, ISIS Facility, STFC

  • Edmondo Gilioli

    Istituto dei Materiali per Elettronica e Magnetismo

  • Paolo G. Radaelli

    Physics, University of Oxford, Clarendon Laboratory, University of Oxford, University of Oxford