Anomalous electron-(magneto)phonon interaction in doped LaOFeAs

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• Jose M Soler, Universidad Autonoma de Madrid
• Monday 15 December 2008, 16:00-17:00
• Harker 2 lecture room, Department of Earth Sciences, Downing Site.

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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.

This talk is part of the Mineral Sciences Seminars series.

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• Department of Earth Sciences seminars
• Harker 2 lecture room, Department of Earth Sciences, Downing Site
• Mineral Sciences Seminars

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