Abstract
The longitudinal and transversal forced magnetostrictions of a single crystal of samarium metal have been investigated in a static magnetic field up to $45\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. The data show pronounced features of a spin-flop transition initiating at an applied field of about $30\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. The measured forced magnetostriction is about 1 order of magnitude smaller than the spontaneous magnetostriction. Based on a model calculation of the magnetic phase diagram these features have been interpreted within the exchange striction model. The moments of the quasicubic Sm sites enter a spin-flop phase at about $30\phantom{\rule{0.3em}{0ex}}\mathrm{T}$ and ferromagnetic saturation is predicted at $60\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. Similarly the model predicts a spin-flop phase for the hexagonal Sm sites at $140\phantom{\rule{0.3em}{0ex}}\mathrm{T}$ and ferromagnetic saturation at $390\phantom{\rule{0.3em}{0ex}}\mathrm{T}$.
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