Finite-temperature magnetism of disordered Fe-Cr alloys

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Abstract
A theory of the local-environment effects (LEE) at finite temperatures has been extended to the antiferromagnetic case in order to investigate the magnetism of Fe-Cr alloys in the ferromagnetic and antiferromagnetic states. The magnetic phase diagram of Fe-Cr alloys, magnetization and sublattice magnetization versus concentration curves, internal-field distribution function, high-field susceptibility, paramagnetic susceptibility, and other magnetic quantities have been calculated at finite temperatures by making use of the theory of the LEE. It is found that the Fe local moments show a strong LEE in the antiferromagnetic as well as in the ferromagnetic one. The nature of the LEE in the antiferromagnetic state changes with the disappearance of the gap in the density of states. An overall agreement between various experiments and the present theory is obtained, but the extended interactions between local moments have to be taken into account to explain the low-temperature properties of Fe-Cr alloys such as the spin-glass state.

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