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The simple structure of HgBa$_2$CuO$_{4+\delta}$ (Hg1201) is ideal amongcuprates for study of the pseudogap phase as a broken symmetry state. We haveperformed $^{17}$O nuclear magnetic resonance (NMR) on an underdoped Hg1201crystal with transition temperature of 74 K to look for circulating orbitalcurrents proposed theoretically and inferred from neutron scattering. Thenarrow spectra preclude static local fields in the pseudogap phase at theapical site, suggesting that the moments observed with neutrons arefluctuating. The NMR frequency shifts are consistent with a dipolar field fromthe Cu$^{+2}$ site.

Absence of static orbital current magnetism at the apical oxygen site in HgBa$_2$CuO$_{4+\delta}$ from NMR