Abstract
Cr--13.5 at. % Fe alloy doped with 0.7 at. % $^{119}\mathrm{Sn}$ is studied at temperatures T from 4.2 to 330 K using M\"ossbauer-effect spectroscopy at $^{57}\mathrm{Fe}$ and $^{119}\mathrm{Sn}$ sites. The temperature dependence of the hyperfine (hf) fields H and isomer shifts I indicates that the alloy undergoes a reentrant transition on lowering T, from a paramagnetic (PM) through an antiferromagnetic (AFM) to a spin-glass (SG) state, in agreement with a recently published phase diagram [S. K. Burke et al., J. Phys. F 13, 451 (1983)]. Both magnetic states are found to be heterogeneous, containing a PM phase in addition. The PM part varies with T and amounts to \ensuremath{\sim}75% in the AFM phase just above the transition temperature (AFM\ensuremath{\rightarrow}SG) and drops to \ensuremath{\sim}25% when entering the SG phase (T\ensuremath{\simeq}20 K). Comparison with recently obtained results for an Fe--25 at. % Cr alloy [S. M. Dubiel, Ch. Sauer, and W. Zinn, Phys. Rev. B 30, 6285 (1984)] is made and discussed.
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