Critical properties of uranium selenide

Bulk magnetization measurements and elastic neutron scattering have been used to determine the critical exponents β, γ and δ for single-crystal USe. The magnetization behavior in the ferromagnetic region is significantly influenced by anisotropy. An anomalously low value of β = 0.246±0.010 is observed and this is discussed in terms of an axial next-nearest-neighbor Ising model.