Extended Data Fig. 3: Time-Of-Flight neutron powder diffraction data and pair distribution function.

Panel a shows the Rietveld refinement of ambient temperature Time-of-Flight neutron powder diffraction data from a medium-resolution detector bank centred around 2θ = 63.6^◦. Data (red points), calculated pattern (black line), Bragg positions (green markers) and difference pattern (blue line) are shown. Panel b displays the experimental Pair Distribution Function (PDF) of Ce₂Sn₂O₇ (blue open circles) obtained from all detector banks and after usual corrections and background subtraction (see Supplementary Information). The red line is a fit of the PDF using a perfect pyrochlore structure, and the green line shows the difference between the experiment and this calculation. The PDF provides a powerful tool to further check and confirm the structure of the sample. In particular, it is highly sensitive to the environment around Ce³⁺, and the analysis fails to provide evidence for any significant deviations of local structure relative to that in a perfect pyrochlore structure.