Magnetic ordering in EuB6, investigated by neutron diffraction

An elastic neutron scattering study of the temperature-dependence of the or dered magnetic moment in EuB6 is presented. The decrease of the saturation magnetization of similar to 7 mu(B) with increasing temperature is shown to follow the Bloch T-3/2-law, with no indication of a spin-gap behavior. The magnetic coupling constant deduced from the Bloch law fit corresponds to a mean-field ordering temperature of similar to 12 K, close to the actually observed ordering temperature and the paramagnetic Curie-temperature deduce d from high-temperature magnetic susceptibility. (C) 1998 Elsevier Science Ltd. All rights reserved.