Fig. 3.

Temperature dependence of the $B_{1g}$ charge nematic susceptibility for SP208 ($T_S$ = 87 K) and MK ($T_S$ = 88.5 K) using 2.33 eV photons. Also shown are data on SP208 using a different excitation energy (2.54 eV) and the susceptibility in the other symmetry channels on SP208 ($A_{1g}$ and $B_{2g}$). The lines are Curie–Weiss fits of the $B_{1g}$ susceptibility above $T_S$.