Figure 1. Magnetic structure determination of Cd₂Os₂O₇ with neutron diffraction.

(a) NPD measurements on ¹¹⁴Cd₂Os₂O₇. The ¹¹⁴Cd isotope was used to overcome the significant neutron absorption of Cd. The data (red circle) show the difference between measurements taken at 240 and 160 K and was fit with an all-in/all-out magnetic structural model (black line). The blue line is the difference between the measurement and magnetic model. (Inset) The (220) magnetic reflection intensity, 2θ=39.1°, shows magnetic ordering occurs at T_N=225 K. The error on the data represents the square root of the measured counts. The red line is a guide to the eye derived from a least squares fit to a power law. (b) The spins (blue arrows) all point in or out of the centre of the tetrahedron forming the all-in/all-out magnetic structure in Cd₂Os₂O₇. The bonds between Os ions forming the tetrahedra are shown as solid lines.