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The value of the upper critical field Hc2, a fundamental characteristic ofthe superconducting state, has been subject to strong controversy in high-Tccopper-oxides. Since the issue has been tackled almost exclusively bymacroscopic techniques so far, there is a clear need for local-probemeasurements. Here, we use 17O NMR to measure the spin susceptibility$\chi_{spin}$ of the CuO2 planes at low temperature in charge orderedYBa2Cu3Oy. We find that $\chi_{spin}$ increases (most likely linearly) withmagnetic field H and saturates above field values ranging from 20 to 40 T. Thisresult is consistent with Hc2 values claimed by G. Grissonnanche et al. [Nat.Commun. 5, 3280 (2014)] and with the interpretation that thecharge-density-wave (CDW) reduces Hc2 in underdoped YBa2Cu3Oy. Furthermore, theabsence of marked deviation in $\chi_{spin}(H)$ at the onset of long-range CDWorder indicates that this Hc2 reduction and the Fermi-surface reconstructionare primarily rooted in the short-range CDW order already present in zerofield, not in the field-induced long-range CDWorder. Above Hc2, the relativelylow values of $\chi_{spin}$ at T=2 K show that the pseudogap is a ground-stateproperty, independent of the superconducting gap.

Spin susceptibility of charge ordered YBa2Cu3Oy across the upper critical field