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The sign-reversing fully gapped superconducting state, which is expected tobe realized in oxypnictide superconductors, can be prominently affected bynonmagnetic impurities due to the interband scattering of Cooper pairs. Westudy this problem based on the isotropic two-band BCS model: In oxypnictidesuperconductors, the interband impurity scattering $I'$ is not equal to theintraband one $I$. In the Born scattering regime, the reduction in Tc issizable and the impurity-induced density of states (DOS) is prominent if $I\simI'$, due to the interband scattering. Although impurity-induced DOS can yield apower-law temperature dependence in $1/T_1$, a sizable suppression in Tc isinevitably accompanied. In the unitary scattering regime, in contrast, impurityeffect is very small for both Tc and DOS except at $I=I'$. By comparing theoryand experiments, we expect that the degree of anisotropy in the $s_\pm$-wavegap function strongly depends on compounds.

Impurity-induced in-gap state and Tc in sign-reversing s-wave superconductors: analysis of iron oxypnictide superconductors