Abstract
Neutron diffraction studies on a single crystal of Tb 0.5 Er 0.5 alloy which had been considered to be a tilted helix structure from magnetization measurements, have been carried out at 4.2 K. It has been found that not only the fundamental satellites, but also the very weak 5th and 7th order harmonic satellites are observable at 4.2 K. From the analyses of the observed structure factors, the magnetic structure could be interpreted to be a homogeneous tilted helix with a tilt angle of 17° for both Tb and Er moments at 4.2 K. The appearance of the higher order satellites suggests a bunching state where the magnetic moments projected in the basal plane bunch about the easy directions. On the basis of the theory of Sherrington, the stability of tilted helical ordering in the ground state is briefly discussed.
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