Density Functional Study of LaFeAsO1−xFx: A Low Carrier Density Superconductor Near Itinerant Magnetism

D. J. Singh; M.-H. Du

doi:10.1103/PhysRevLett.100.237003

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Density Functional Study of LaFeAsO1−xFx: A Low Carrier Density Superconductor Near Itinerant Magnetism

D. J. Singh, M.-H. Du

DOI 10.1103/PhysRevLett.100.237003 · Physical Review Letters

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaFeAs(O,F) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown
LaOFeP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4	Pressure not reported	unknown
LaONiP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3	Pressure not reported	unknown
LaOFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown