$^{17}$O and $^{199}$Hg NMR measurements of HgBa$_2$CuO$_{4+y}$ single crystals*

The high superconducting transition temperature and the simple tetragonal structure of HgBa$_2$CuO$_{4+y}$ (Hg1201) makes this material an ideal candidate to study unconventional superconductivity in the cuprates[1]. Nuclear magnet resonance has been performed on Hg1201 single crystals which have been annealed in an $^{17}$O atmosphere to various dopings. Preliminary results of the NMR spectra and relaxation of both $^{17}$O and $^{199}$Hg are presented. Narrow linewidths allow for the resolution of both $^{17}$O lattice sites and a doping dependent $^{199}$Hg spectral splitting[2]. This work is supported by \textbf{DOE/BES: DE-FG02-05ER46248} and the NHMFL by NSF and the State of Florida.[1] N. Bari\u{s}i\'{c} \textit{et al}, PRB \textbf{78}, 054518 (2008) [2] J. Haase \textit{et al}, arXiv:1110.601v1 (2011)