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

F. Sakano, K. Nakamura, T. Kouchi +13

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 lattice parameters of the iron-pnictogen (Fe$Pn$) layer are similar to those…