LaFeAsO$_{1-x}$F$_x$: A low carrier density superconductor near itinerant magnetism

Details LaFeAsO$_{1-x}$F$_x$: A low carrier density superconductor near itinerant magnetism LaFeAsO$_{1-x}$F$_x$: A low carrier density superconductor near itinerant magnetism

2008-03-04

arxiv.org/abs/0803.0429v2

Physical Review Letters 100, 237003 (2008)

Physics

Condensed Matter

Superconductivity

Shortened published form. Typos corrected

Scientific paper

10.1103/PhysRevLett.100.237003

Density functional studies of 26K superconducting LaFeAs(O,F) are reported. We find a low carrier density, high density of states, $N(E_F)$ and modest phonon frequencies relative to $T_c$. The high $N(E_F)$ leads to proximity to itinerant magnetism, with competing ferromagnetic and antiferromagnetic fluctuations and the balance between these controlled by doping level. Thus LaFeAs(O,F) is in a unique class of high $T_c$ superconductors: high $N(E_F)$ ionic metals near magnetism.

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