Stripe antiferromagnetic correlations in LaFeAsO1-xFx probed by 75As NMR

Abstract

The anisotropy of the nuclear spin-lattice relaxation rate $1/T_1$ of ${}^{75}$As was investigated in the iron-based superconductor LaFeAs(O${}_{1-x}$F${}_x$) ($x=0.07,0.11$ and 0.14) as well as LaFeAsO. While the temperature dependence of the normal-state $1/T_{1}T$ in the superconducting (SC) $x=0.07$ is different from that in the SC $x=0.11$, their anisotropy of $1/T_1$, $R\equiv (1/T_1{)}_{H\parallel ab}/(1/T_1{)}_{H\parallel c}$ in the normal state is almost the same ($\simeq$ 1.5). The observed anisotropy is ascribable to the presence of the local stripe correlations with $Q=(\pi ,0)$ or $(0,\pi )$. In contrast, $1/T_1$ is isotropic and $R$ is approximately 1 in the overdoped $x=0.14$ sample, where superconductivity is almost suppressed. These results suggest that the presence of the local stripe correlations originating from the nesting between hole and electron Fermi surfaces is linked to high-$T_c$ superconductivity in iron pnictides.

4 pages, 3 figures, Accepted for publication in Phys. Rev. B

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