Spin dynamics in the cubic Heisenberg ferromagnet EuS
作者： H. G. Bohn , A. Kollmar , W. Zinn
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摘要: Using the inelastic-neutron-scattering technique, we have undertaken an extensive study of spin dynamics in EuS. The experiments were performed on a $^{153}\mathrm{Eu}$S single crystal with scattering vector $\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}}$ along [100] direction. $q$ values extended over range between 0.11 and 1.06 ${\mathrm{\AA{}}}^{\ensuremath{-}1}$, temperatures ranged from $1.2 \mathrm{to} 50 \mathrm{K}(=3{T}_{c})$. It was found that spin-wave renormalization theory holds well up to $0.8{T}_{c}$. For above ${T}_{c}$ highest our experiments, line shapes are described by recently developed correlation theories. From dependence linewidth dynamical response at $T={T}_{c}$, scaling exponent $z=2.09(6)$ deduced. deviation pure Heisenberg value $z=\frac{5}{2}$ is attributed dipolar interactions.
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