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SUMMARY:Anomalous electron-(magneto)phonon interaction in doped LaOFeAs - 
 Jose M Soler\, Universidad Autonoma de Madrid
DTSTART:20081215T160000Z
DTEND:20081215T170000Z
UID:TALK15197@talks.cam.ac.uk
CONTACT:11283
DESCRIPTION:First principles calculations show\, in agreement with\nexperi
 ments\, that undoped LaOFeAs is antiferromagnetic\,\nand that it becomes n
 on magnetic at a critical electron\ndoping. In the doped non-magnetic phas
 e\, the increase\nin separation between the As and Fe planes\, during the\
 nvibration of the $A_{1g}$ phonon\, reintroduces an\noscillatory non-colli
 near magnetism in the Fe atoms.\nThis coupling of magnetism with vibration
 s induces\nanharmonicities and an electron-phonon interaction much\nlarger
  than in the pure paramagnetic case. We propose\nthat such enhanced intera
 ctions play an essential role\nin superconducting compounds close to an at
 iferromagnetic\nphase transition.
LOCATION:Harker 2 lecture room\, Department of Earth Sciences\, Downing Si
 te
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