Figure 2: Neutron diffraction data on single crystals of α-RuCl3.
From: Atomic-scale observation of structural and electronic orders in the layered compound α-RuCl3

(a) Temperature dependence of the (1,1,3) and (1,1,4) peak intensities. The hysteresis of the (1,1,3) and (1,1,4) orders is clearly observed (shaded area). The structural transition temperature between monoclinic and trigonal lattices is Ts=165 K for warming up and Ts=140 K for cooling down. (b) L-scans at several selected values of temperature.