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Charge, orbital and spin ordering phenomena in the mixed valence manganite (NaMn3+3)(Mn3+2Mn4+2)O12

Nature Materials volume 3, pages 48–52 (2004)Cite this article

Abstract

Mixed-valence manganites with the ABO3 perovskite structure display a variety of magnetic and structural transitions, dramatic changes of electrical conductivity and magnetoresistance effects. The physical properties vary with the relative concentration of Mn3+ and Mn4+ in the octahedral corner-sharing network, and the proportion of these two cations is usually changed by doping the trivalent large A cation (for example, La3+) with divalent cations. As the dopant and the original cation have, in general, different sizes, and as they are distributed randomly in the structure, such systems are characterized by local distortions that make it difficult to obtain direct information about their crystallographic and physical properties. On the other hand, the double oxides of formula AA′3Mn4O12 contain a perovskite-like network of oxygen octahedra centred on the Mn cations, coupled with an ordered arrangement of the A and A′ cations, whose valences control the proportion of Mn3+ and Mn4+ in the structure. The compound investigated in this work, (NaMn3+3)(Mn3+2Mn4+2)O12, contains an equal number of Mn3+ and Mn4+ in the octahedral sites. We show that the absence of disorder enables the unambiguous determination of symmetry, the direct observation of full, or nearly full, charge ordering of Mn3+ and Mn4+ in distinct crystallographic sites, and a nearly perfect orbital ordering of the Mn3+ octahedra.

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Figure 1: Crystal and magnetic structure of (NaMn3)Mn4O12.
Figure 2: Temperature dependence of the cell parameters of (NaMn3)Mn4O12.
Figure 3: Structural and magnetic phase transitions.
Figure 4: Temperature dependence of the d.c. magnetization.
Figure 5: Temperature dependence of the resistivity.

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Acknowledgements

The authors thank T. Besagni and P. Ferro for technical assistance and acknowledge the CNR (Consiglio Nazionale delle Ricerche) for partial financial support within the framework of the National Project on 'Applicazioni della superconduttività ad alta Tc'.

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Authors and Affiliations

  1. Istituto dei Materiali per Elettronica e Magnetismo-CNR, Area delle Scienze, Parma, 43010, Italy

    A. Prodi, E. Gilioli, A. Gauzzi, F. Licci, M. Marezio & F. Bolzoni

  2. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, 20899, Maryland, USA

    Q. Huang, A. Santoro & J. W. Lynn

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  1. A. Prodi
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Correspondence to A. Prodi.

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Supplementary Information, Table S2

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Prodi, A., Gilioli, E., Gauzzi, A. et al. Charge, orbital and spin ordering phenomena in the mixed valence manganite (NaMn3+3)(Mn3+2Mn4+2)O12. Nature Mater 3, 48–52 (2004). https://doi.org/10.1038/nmat1038

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