Abstract
Neutron diffraction was performed on polycrystalline TbAsO 4 down to temperatures of 0.4 K. The magnetic structure below T N = 1.48K is incommensurate with the crystallographic unit cell; the magnetic propagation vector is [0.038,0.076, 0.019]. The magnetic Tb moments are oriented perpendicular to the c-axis, forming either a spiral structure (μ = 6.9μ B) or a sinusoidally modulated structure (μ max =9.5μ B). In view of the anisotropy in the Tb g-tensor the modulated structure is preferred.
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