Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-11-10
JETP Letters 87, 615 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1134/S0021364008100093
We investigate magnetic properties of a frustrated Heisenberg antiferromagnet with a face-centered cubic (FCC) lattice and exchange interactions between the nearest- and next-nearest neighbours, J1 and J2. In a collinear phase with the wave vector Q = (pi,pi,pi) the equations of the self-consistent spin-wave theory for the sublattice magnetization and the average short range order parameter are obtained and numerically solved. The dependence of the Neel temperature T_N on the ratio J2/J1 is obtained. It is shown, that at strong enough frustration there is a wide temperature region above T_N with strong short range magnetic order. Application of this result to description of structural phase transition between alpha and gamma-phase of Fe is considered.
Ignatenko A. N.
Irkhin Yu. V.
Katanin Andrey A.
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