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We investigate magnetic properties of a frustrated Heisenberg antiferromagnetwith a face-centered cubic (FCC) lattice and exchange interactions between thenearest- and next-nearest neighbours, J1 and J2. In a collinear phase with thewave vector Q = (pi,pi,pi) the equations of the self-consistent spin-wavetheory for the sublattice magnetization and the average short range orderparameter are obtained and numerically solved. The dependence of the Neeltemperature T_N on the ratio J2/J1 is obtained. It is shown, that at strongenough frustration there is a wide temperature region above T_N with strongshort range magnetic order. Application of this result to description ofstructural phase transition between alpha and gamma-phase of Fe is considered.

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