LaFeAsO1-xFx: A low carrier density superconductor near itinerant magnetism

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.100.237003· OSTI ID:968253

Singh, David J ^[1]; Du, Mao-Hua ^[1]

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1. ORNL

Density functional studies of 26 K superconducting LaFeAs(O,F) are reported. We find a low carrier density, high density of states, N(E{sub F}), and modest phonon frequencies relative to T{sub c}. The high N(E{sub F}) 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 T{sub c} superconductors: high N(E{sub F}) ionic metals near magnetism.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 968253
• Journal Information: Physical Review Letters, Vol. 100, Issue 23; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CARRIER DENSITY
FLUCTUATIONS
FUNCTIONALS
MAGNETISM
PHONONS
SUPERCONDUCTORS