Magnetic structure of PrCo₂Ge₂, a neutron diffraction study

The crystallographic structure of the compound PrCo₂Ge₂ is of the BaAl₄ type. The space group is I4/mmm and the lattice constants are a = 4.048 and c = 10.178 Å. A neutron diffraction study revealed a transition to a magnetically ordered state at T_N ~ 27 K and six superlattice lines below T_N. It is possible to index these lines according to a sinusoidal magnetic structure with a period τ^-1 = 13.94 Å along c. Observed intensities are consistent with ordering of the Pr sublattice with the magnetic axis along c.