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We have performed $^{75}$As and $^{23}$Na nuclear magnetic resonance (NMR)measurements on a single crystal of NaFe$_{0.9835}$Co$_{0.0165}$As and foundmicroscopic coexistence of superconductivity with a two-component spin densitywave (SDW). Using $^{23}$Na NMR we measured the spatial distribution of localmagnetic fields. The SDW was found to be incommensurate with a major componenthaving magnetic moment ($\sim0.2\,\mu_B$/Fe) and a smaller component withmagnetic moment ($\sim0.02\,\mu_B$/Fe). Spin lattice relaxation experimentsreveal that this coexistence occurs at a microscopic level.

Microscopic coexistence of a two-component incommensurate spin density wave with superconductivity in underdoped NaFe$_{0.983}$Co$_{0.017}$As