Extended Data Fig. 6: Predicting Kres for YBa2Cu3O6.43.
From: Signatures of two gaps in the spin susceptibility of a cuprate superconductor
The data at B = 15 T (measured with B | |c) and at 30 T (measured with B tilted by 16° off the c axis) correspond to the zero-temperature extrapolation of our K(T) measurements of O(2) sites at low T. The value at B = 0 is the zero-temperature extrapolation of our K(T) measurements of O(2) sites at low T, with B ⊥ c and B = 9 T « \({B}_{{\rm{c}}2}^{\perp }\). The thick blue line represents the expected B dependence on the basis of results at other doping levels8: linear increase up to Bc2(T = 0) = 45 T (value taken from an interpolation of the results in refs. 69,70) and saturation above Bc2. The value K(T = 0, B = Bc2) = Kres is predicted to be equal to about 0.036%. Within error bars, this agrees well with the fit result in Fig. 2b: Kres(fit) = 0.039 ± 0.01%. Error bars represent the added uncertainties in the line positions, in the field reference and in the 2nd-order quadrupole shift correction, all calculated from one standard deviation in the Gaussian peak fits of the relevant NMR lines.
