Extended Data Fig. 7: Absence of direct correlation between residual spin susceptibility and disorder.
From: Signatures of two gaps in the spin susceptibility of a cuprate superconductor
The linewidth values correspond to the width of the 17O(2) central line at room temperature. For p = 0.064, we used the ratio of 89Y NMR linewidth between p = 0.064 and p = 0.072 samples. While Kres=Kspin(T = 0) is nearly identical for p = 0.109 and p = 0.090, disorder (as quantified by the NMR line width) differs by a factor of five. p = 0.135 also has identical Kres, yet its linewidth is larger than p = 0.109 by a factor 2.3. Therefore, although both χres and disorder tend to increase at low doping, this likely occurs for different reasons: weakening of CDW correlations for the former, increased oxygen disorder for the latter (notice that the weakening of CDW correlations may, or may not, be partially caused by the increased disorder at low p). Error bars for Kres represent one standard deviation in the fit results. Lines are guides to the eye.
