Abstract
Small angle neutron scattering measurements have been performed on a single crystal of the reentrant spin glass alloy Fe 0.715 Al 0.285 . The present study covers a wide range in the momentum transfer Q by utilizing pulsed cold neutrons. The neutron scattering data are analyzed assuming that the observed scattering at smaller Q is attributed to macroscopic thermal spin fluctuations and that the one at larger Q is dominated by microscopic fluctuations. The results suggest that the latter fluctuations might trigger a breaking down of the ferromagnetic phase and finally induce a spin glass state.
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