Short-range antiferromagnetic orientational correlations inRb3C60

Abstract

The neutron pair distribution function (PDF) of ${\mathrm{Rb}}_3$ ${\mathrm{C}}_{60}$ at 10 K reveals local deviations from the Stephens model of merohedral disorder. The experimental PDF in the 3–7 Å range is best represented by a greater fraction of near-neighbor pairs with opposite standard orientations than would be expected from purely random decoration, indicating the presence of short-range ‘‘antiferromagnetic’’ orientational correlations.