Abstract
Density functional studies of 26 K superconducting LaFeAs(O,F) are reported. We find a low carrier density, high density of states, , and modest phonon frequencies relative to . The high 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 superconductors: high ionic metals near magnetism.
- Received 4 March 2008
DOI:https://doi.org/10.1103/PhysRevLett.100.237003
©2008 American Physical Society