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The helimagnetic structure of determined by zero-field neutron polarimetry

Zero-field neutron polarimetric measurements have been made on semi-metallic phosphorus-rich with x = 0.80 to determine the magnetic structure of the low-temperature helimagnetic phase. Unlike unpolarized neutron diffraction, this technique allows an unambiguous determination of the spin configuration. We show that the previous structure model derived from unpolarized neutron diffraction data in which the Eu magnetic moments were assumed to be confined to the a - c plane is not correct. The zero-field neutron polarimetric data clearly demonstrate the existence of a spin component parallel to the monoclinic b-axis. The new model based on these observations is in better agreement with the diffraction intensities obtained from unpolarized neutron diffraction. In this model the low-temperature helimagnetic phase in phosphorus-rich has two components, one parallel to the b-axis and a second which lies in the a - c plane nearly perpendicular to the propagation vector.