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We present $^{75}$As Nuclear Magnetic and Quadrupole Resonance results (NMR,NQR) on a new set of LaFeAsO$_{1-x}$F$_x$ polycrystalline samples. Improvedsynthesis conditions led to more homogenized samples with better control of thefluorine content. The structural$\equiv$nematic, magnetic, and superconductingtransition temperatures have been determined by NMR spin-lattice relaxationrate and AC susceptibility measurements. The so-determined phase diagramdeviates from the published one especially for low F-doping concentrations.However, if the doping level is determined from the NQR spectra, both phasediagrams can be reconciled. The absence of bulk coexistence of magnetism andsuperconductivity and a nanoscale separation into low-doping-like andhigh-doping-like regions have been confirmed. Additional frequency dependentintensity, spin-spin, and spin-lattice relaxation rate measurements onunderdoped samples at the boundary of magnetism and superconductivity indicatethat orthorhombicity and magnetism originate from the low-doping-like regions,and superconductivity develops at first in the high-doping-like regions.

A unified phase diagram of F-doped LaFeAsO by means of NMR and NQR parameters