Phys. Rev. Lett. 100, 237003 (2008) [4 pages]Density Functional Study of LaFeAsO1-xFx: A Low Carrier Density Superconductor Near Itinerant MagnetismReceived 4 March 2008; published 12 June 2008 Density functional studies of 26 K superconducting LaFeAs(O,F) are reported. We find a low carrier density, high density of states, N(EF), and modest phonon frequencies relative to Tc. The high N(EF) leads to proximity to itinerant magnetism, with competing ferromagnetic and antiferromagnetic fluctuations and the balance between these controlled by the doping level. Thus LaFeAs(O,F) is in a unique class of high Tc superconductors: high N(EF) ionic metals near magnetism. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.237003
DOI:
10.1103/PhysRevLett.100.237003
PACS:
74.25.Jb, 71.18.+y, 74.25.Kc, 74.70.Dd
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