Abstract
Mossbauer effect measurements on recoilless emission from 119Sn nuclei dissolved in chromium show that, at temperatures below the Neel temperature of chromium, a distribution of hyperfine fields acts on the tin nuclei. The observations are consistent with the assumption that the hyperfine field distribution results from a linear spin-density wave polarization which in chromium is incommensurate with the lattice. For a commensurate spin-density wave polarization it is expected that a constant magnitude hyperfine field acts on the 119Sn nuclei. This expectation is confirmed by Mossbauer measurements on 119Sn nuclei in 0.8 wt% MnCr alloy at a temperature at which a commensurate magnetic structure exists.
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