Systematic ^{75}As NMR study of the dependence of low-lying excitations on F doping in the iron oxypnictide LaFeAs(O_{1-x}F_{x})

Yusuke Nakai, Shunsaku Kitagawa, Kenji Ishida +3

We report systematic ${}^{75}$As NMR studies on LaFeAs(O${}_{1-x}$F${}_x$) ($0\le x\le 0.14$). At $x=0.04$ near the phase boundary, from resistivity, spin-lattice relaxation rate $1/T_1…