Abstract
The temperature dependence of the low-field magnetization and of Mössbauer spectra has been observed for a high-Fe-concentrated fcc Cu 0.74Fe 0.26 alloy. At low temperatures, the zero-field-cooled and field-cooled magnetization show different thermomagnetic behaviour. The average hyperfine field was found to increase with decreasing temperature below the Curie-temperature T c of about 240 K. An additional increase is observed below the freezing (“spin-canting”) temperature T f of about 40 K. In Mössbauer spectra measured in longitudinal external magnetic fields, the second and fifth lines of the sextet (i.e. the Δm = 0-nuclear transitions) appear below T f, while they disappear above T f. These results indicate that the present alloy is a reentrant spin-glass system, characterized by freezing of transverse spin components below T f.
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