Magnetic Structure of DyC2

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Abstract
The compound, DyC2, having the tetragonal body-centered CaC2-type structure has been shown by neutron diffraction to exhibit the magnetic spin alignment of a linear, transverse wave mode below the Néel temperature of 59°K. This static moment wave is propagating along the a axis and is polarized in the c-axis direction. The root-mean-square and maximum saturation moments per Dy are 8.37 and 11.8 Bohr magnetons, respectively, the latter being considerably larger than the ordered moment of the free Dy3 + ion, 10.0 μB. The wavelength of the moment wave is about 1.3 times the a spacing and is practically temperature independent. An additional, coexisting spin alignment with a very small moment appears to take place below 31°K. The crystallographic parameters in the range 300°–5°K are also presented. The thermal-neutron coherent scattering amplitude of Dy is established as (1.70 ± 0.01) × 10− 12 cm.

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