Extended Data Fig. 8: Determining the oxygen concentration with chain-Cu NMR.
From: Signatures of two gaps in the spin susceptibility of a cuprate superconductor
63Cu(1E) (empty-chain site) low-frequency quadrupole satellites of the 63Cu NMR spectrum. The labels iV (i = 0, 1, 2, 3) indicate Cu(1E) sites having a number i of nearest-neighbor vacancies. Each line is fitted with a Gaussian function and the relative integrated intensities of the Cu(1E)0V and Cu(1E)1V sites are used to determine the actual oxygen concentration y (see ref. 65 for details about the method).
