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    Charge stacking in the half-doped manganites

    Popovic, Zoran S.
    Satpathy, Sashi Sekhar, 1956-
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    Date
    2002
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    Article
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    Abstract
    The stability of the charge-stacked structure vis-à-vis the charge-alternate structure in the half-doped manganites is studied with a model that includes electronic kinetic energy, onsite and intersite Coulomb interactions, the Jahn-Teller energy, and the antiferromagnetic superexchange between the manganese core spins. It is shown that for a single zigzag chain, the electronic kinetic energy stabilizes the standard chain, with Mn3+ at the bridge site and Mn4+ at the corner site, over the “reversed” zigzag chain with the two Mn valences interchanged. The electronic kinetic energy and magnetic interactions stabilize the three-dimensional charge-stacked structure, while a large intersite Coulomb interaction V⩾Vc would stabilize the charge-alternate structure. It is argued that the magnitude of V is small enough that the charge-stacked structure is stabilized in the half-doped manganites such as La1/2Ca1/2MnO3.
    URI
    http://hdl.handle.net/10355/9435
    Citation
    J. Appl. Phys. 91, 8132 (2002)
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    • Physics and Astronomy publications (MU)

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