Abstract
Spherical neutron polarimetry has been used to answer open questions about different magnetic phases in HoNi{sub 2}B{sub 2}C, which are important in their interplay with superconductivity. We established that the incommensurate a{sup *} structure of k{sub 3}=(0.585 0 0) at 5.4 K in a zero magnetic field is a transverse-amplitude modulated wave with the magnetic moment along the b direction of the tetragonal structure. The depolarization of a neutron beam scattered from the k{sub 2}=(0 0 0.915) reflections reveals a multidomain state but does not allow an unambiguous determination of the spin configuration. Based on present knowledge of borocarbides and other rare-earth systems we give preference to a long-range incommensurate helical structure as the origin of the k{sub 2}=(0 0 0.915) reflections.
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