Fig. 4

Anisotropy of magnetic susceptibility. a Temperature dependence of 2χ_ab (upper panel) and χ_aa − χ_bb (lower panel) for p ≈ 0.11. b, c Same plots for p ≈ 0.12 and 0.125, respectively. Solid arrows indicate the onset temperatures of χ_ab, which well coincides with T^*, as shown in Fig. 1. Dashed arrows indicate the temperatures at which χ_ab deviates from the extrapolation from high temperature shown by the bold lines. These temperatures are close to T_CDW, as shown in Fig. 1. d χ_ab, normalised by the values at T/T^* = 0.7 for different doping levels plotted as a function of T/T^*. The data collapse onto a universal curve, except for the low-temperature regime where a suppression of the χ_ab is observed, indicating a scaling behaviour. Error bar represents s.d. of the sinusoidal fit to the τ_2ϕ(ϕ) curves