Abstract
Neutron diffraction investigations have been made on metallic europium which show the metal to be antiferromagnetic with a Néel temperature of 87°±1°K. The observed magnetic reflections can be interpreted in terms of a helical spin structure having a pitch of 3.60 a0 and a helix axis in the (100) direction or an amplitude modulated structure in the (100) direction having a periodicity of 3.60 a0. Between 20° and 87°K, within experimental error, the intensities of the magnetic reflections are proportional to (TN—T)½, where TN is the Néel temperature. The helix pitch is not a function of temperature.
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