NMR Investigation of the iron-based superconductors Ca4(Mg,Ti)3Fe2As2O8-y and Ca5(Sc,Ti)4Fe2As2O11-y

Y. Tomita, H. Kotegawa, Y. Tao +5

${}^{75}$As and ${}^{45}$Sc NMR measurements unravel the electronic state for Fe-based superconductors with perovskite-type blocking layers Ca${}_4$(Mg,Ti)${}_3$Fe${}_2$As${}_2$O${}_{8-y}$ ($T_c…