Abstract
The longitudinal and transverse magnetostriction in EuS were measured at 1.8<T<146 K, in magnetic fields up to 130 kOe. In the paramagnetic phase (T≳Tc=16.49 K) the magnetostriction is predominantly due to the strain dependence of the exchange energy. The results are explained in terms of the theory of Callen and Callen supplemented by numerical calculations of the nearest-neighbor and next-nearest-neighbor two-spin correlation functions. The agreement with theory is good, but small deviations near Tc suggest that EuS departs from the ideal Heisenberg model.
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