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We report a systematic NMR study on[Sr$_4$Sc$_2$O$_6$]Fe$_2$(As$_{1-x}$P$_x$)$_2$, for which the local latticeparameters of the iron-pnictogen (Fe$Pn$) layer are similar to those of theseries LaFe(As$_{1-x'}$P$_{x'}$)O, which exhibit two segregatedantiferromagnetic (AFM) order phases, AFM1 at $x'$=0-0.2 and AFM2 at$x'$=0.4-0.7. Our results revealed that the parent AFM1 phase at $x$=0disappears at $x$=0.3-0.4, corresponding to a pnictogen height ($h_{pn}$) fromthe Fe-plane of 1.3-1.32 \AA, which is similar to that ofLaFe(As$_{1-x'}$P$_{x'}$)O and various parent Fe-pnictides. By contrast, theAFM2 order reported for LaFe(As$_{0.4}$P$_{0.6}$)O does not appear at$x\sim$0.8, although the local lattice parameters of the Fe$Pn$ layer and themicroscopic electronic states are quite similar. Despite the absence of the{\it static} AFM2 order, reemergent {\it dynamical} AFM spin fluctuations wereobserved at approximately $x\sim$0.8, which can be attributed to theinstability of the AFM2 phase. We suggest this re-enhancement of AFM spinfluctuations to play a significant role in enhancing the $T_c$ to 17 K for$x$=0.8-1. Finally, we discuss the universality and diversity of thecomplicated magnetic ground states from a microscopic point of view, includingthe difference in the origins of the AFM1 and AFM2 phases, and their relationswith the high superconducting transitions in Fe-pnictides.

physical review. b./physical review. b

High-$T_c$ Iron-phosphide Superconductivity Enhanced by Reemergent  Antiferromagnetic Spin Fluctuations in  (Sr$_4$Sc$_2$O$_6$)Fe$_2$(As$_{1-x}$P$_{x}$)$_2$ probed by NMR