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We performed $^{31}$P-NMR measurements on LaFe(As$_{1-x}$P$_{x}$)O toinvestigate the relationship between antiferromagnetism and superconductivity.The antiferromagnetic (AFM) ordering temperature $T_{\rm N}$ and the moment$\mu_{\rm ord}$ are continuously suppressed with increasing P content $x$ anddisappear at $x = 0.3$ where bulk superconductivity appears. At thissuperconducting $x = 0.3$, quantum critical AFM fluctuations are observed,indicative of the intimate relationship between superconductivity andlow-energy AFM fluctuations associated with the quantum-critical point inLaFe(As$_{1-x}$P$_{x}$)O. The relationship is similar to those observed inother isovalent-substitution systems, e.g., BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$and SrFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$, with the "122" structure. Moreover,the AFM order reappears with further P substitution ($x > 0.4$). The variationof the ground state with respect to the P substitution is considered to belinked to the change in the band character of Fe-3$d$ orbitals around the Fermilevel.

Relationship between Superconductivity and Antiferromagnetism in LaFe(As$_{1-x}$P$_{x}$)O Revealed by $^{31}$P-NMR