Magnetic Phase Diagram of Ternary Alloy System, Au_1−x(Cr_yFe_1−y)_x

Abstract

The magnetic phase diagram of the mixed system of Au(Cr) and Au(Fe), Au_1−x(Cr_yFe_1−y)_x, has been determined by the measurements of the magnetic susceptibility and of the Bragg reflection of neutron scattering. At the nearly equiatomic compound of Cr and Fe, y\simeq0.6, the spin glass state is stable up to the phase boundary of the fcc ternary alloy x\simeq0.28, far beyond the percolation limit. The extension of the spin glass region may be determined due to the competition between the ferromagnetic and the antiferromagnetic nearest-neighbor interactions which are responsible for the formation of the ferromagnetic and the antiferromagnetic long-range order in the Au(Fe) and the Au(Cr) alloys, respectively.