Physics – Condensed Matter – Superconductivity
Scientific paper
2011-03-17
Phys. Rev. Lett. 107, 176402 (2011)
Physics
Condensed Matter
Superconductivity
Supplemental Material added. Published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.107.176402
We show that the Fermi surface (FS) in the antiferromagnetic phase of BaFe$_2$As$_2$ is composed of one hole and two electron pockets, all of which are three dimensional and closed, in sharp contrast to the FS observed by angle-resolved photoemission spectroscopy. Considerations on the carrier compensation and Sommerfeld coefficient rule out existence of unobserved FS pockets of significant sizes. A standard band structure calculation reasonably accounts for the observed FS, despite the overestimated ordered moment. The mass enhancement, the ratio of the effective mass to the band mass, is 2--3.
Eisaki Hiroshi
Harima Hisatomo
Ishida Shigeyuki
Ito Toshimitsu
Iyo Akira
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