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Strong short-range magnetic order in a frustrated FCC lattice and its possible role in the iron structural transformation


The magnetic properties of a frustrated Heisenberg antiferromagnet with the fcc lattice and exchange interaction between the nearest (J 1) and next-to-nearest (J 2) neighbors are studied in this work. For the collinear phase with the wave vector Q= (π,π,π), the equations of the self-consistent spin-wave theory are obtained and solved numerically for the sublattice magnetization and the averaged short-range order parameter. The dependence of the Néel temperatureT N on the ratio J 2/J 1 is found. It is shown that, in the case of a sufficiently strong frustration, strong short-range magnetic order persists over a wide temperature range above T N. The possible application of this result to the mechanism of structural phase transition from α-Fe to γ-Fe is considered.


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Correspondence to A. N. Ignatenko.

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Original Russian Text © A.N. Ignatenko, A.A. Katanin, V.Yu. Irkhin, 2008, published in Pis’ma v Zhurnal Éksperimental’ noĭ i Teoreticheskoĭ Fiziki, 2008, Vol. 87, No. 10, pp. 642–646.

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Ignatenko, A.N., Katanin, A.A. & Irkhin, V.Y. Strong short-range magnetic order in a frustrated FCC lattice and its possible role in the iron structural transformation. Jetp Lett. 87, 555–559 (2008).

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PACS numbers

  • 75.10.Jm
  • 75.30.Kz
  • 75.50.Bb