Abstract
MAGNETIC coupling of next-to-nearest neighbours through a non-magnetic anion (super-exchange) has been explained by Anderson1 by considering ‘excited states’ in which a single electron in a p-orbital of the anion is transferred to one of the neighbouring cations. Goodenough and Loeb2 have emphasized correctly that such interactions are essentially covalent and have given the name ‘semi-covalence’ to Anderson's one-electron transfer. As stressed by Goodenough and Loeb, the increase in Curie or Néel temperatures in series such as MnO-FeO-CoO-NiO, or MnO-MnS-MnSe-MnTe, is evidence for the part played by covalence in magnetic coupling.
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References
Anderson, P. W., Phys. Rev., 79, 350 (1950).
Goodenough, J. B., and Loeb, A. L., Phys. Rev., 98, 391 (1955).
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FYFE, W., VERHOOGEN, J. Covalent Super-Exchange in Solid State Physics. Nature 187, 1108 (1960). https://doi.org/10.1038/1871108a0
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DOI: https://doi.org/10.1038/1871108a0
