Abstract

The contribution of Fe atomic motion to the superconductivity in the K-doped BaFe 2 As 2 system was investigated by 57 Fe nuclear resonant inelastic scattering. A significant K-doping effect was observed in the Fe partial phonon density of states. The present results indicate that low-lying Fe optical modes are softened by K-doping. This demonstrates that the Fe atomic motion correlates with the superconductivity in K-doped BaFe 2 As 2 .

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