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Anomalous electron-(magneto)phonon interaction in doped LaOFeAs

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First principles calculations show, in agreement with experiments, that undoped LaOFeAs is antiferromagnetic, and that it becomes non magnetic at a critical electron doping. In the doped non-magnetic phase, the increase in separation between the As and Fe planes, during the vibration of the $A_{1g}$ phonon, reintroduces an oscillatory non-collinear magnetism in the Fe atoms. This coupling of magnetism with vibrations induces anharmonicities and an electron-phonon interaction much larger than in the pure paramagnetic case. We propose that such enhanced interactions play an essential role in superconducting compounds close to an atiferromagnetic phase transition.

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