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

Abstract

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 of the series LaFe(As${}_{1-x^{\prime }}$P${}_{x^{\prime }}$)O, which exhibit two segregated antiferromagnetic (AFM) order phases, AFM1 at $x^{\prime }$=0-0.2 and AFM2 at $x^{\prime }$=0.4-0.7. Our results revealed that the parent AFM1 phase at $x$=0 disappears at $x$=0.3-0.4, corresponding to a pnictogen height ($h_{pn}$) from the Fe-plane of 1.3-1.32 Å, which is similar to that of LaFe(As${}_{1-x^{\prime }}$P${}_{x^{\prime }}$)O and various parent Fe-pnictides. By contrast, the AFM2 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 the microscopic electronic states are quite similar. Despite the absence of the {\it static} AFM2 order, reemergent {\it dynamical} AFM spin fluctuations were observed at approximately $x\sim$0.8, which can be attributed to the instability of the AFM2 phase. We suggest this re-enhancement of AFM spin fluctuations 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 the complicated magnetic ground states from a microscopic point of view, including the difference in the origins of the AFM1 and AFM2 phases, and their relations with the high superconducting transitions in Fe-pnictides.

arXiv comment10 pages, 8 figures

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