期刊
PHYSICAL REVIEW B
卷 80, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.024515
关键词
barium compounds; Brillouin zones; cobalt compounds; doping profiles; Fermi level; high-temperature superconductors; iron compounds; paramagnetic materials; photoelectron spectra; potassium compounds
资金
- U.S. DOE, Office of Basic Energy Sciences [DE-AC02-05CH11231]
- SSRL, Stanford University [DE-AC02-76SF00515]
- ORNL
- NSF
We use high-resolution angle-resolved photoemission to study the electronic structure of the BaFe2As2 pnictides. We observe two electron bands and two hole bands near the X point, (pi,pi) of the Brillouin zone, in the paramagnetic state for electron-doped Ba(Co0.06Fe0.94)(2)As-2, undoped BaFe2As2, and hole-doped Ba0.6K0.4Fe2As2. Among these bands, only the electron bands cross the Fermi level, forming two electron pockets around X while the hole bands approach but never reach the Fermi level. We show that the band structure of the BaFe2As2 family matches reasonably well with the prediction of local-density approximation calculations after a momentum-dependent shift and renormalization. Our finding resolves a number of inconsistencies regarding the electronic structure of pnictides.
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