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The coexistence of magnetism and superconductivity in theisovalent-P-substituted BaFe$_2$(As$_{1-x}$P$_x$)$_2$ has been investigatedmicroscopically by $^{31}$P-NMR measurements. We found that superconducting(SC) transition occurs in a magnetic region with static ordered moments andthat the moments are reduced below the SC transition temperature $T_{\rm c}$ inthe samples near the phase boundary of magnetism and superconductivity. Ourresults indicate that magnetism and superconductivity coexist spatially butcompete with each other on the same Fermi surfaces. The coexistence state isqualitatively different from that observed in other unconventionalsuperconductors and gives a strict constraint on the theoretical model forsuperconductivity in BaFe$_2$(As$_{1-x}$P$_x$)$_2$.

Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe$_2$(As$_{1-x}$P$_x$)$_2$