Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-01-25
Phys. Rev. B 81, 155124 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 7 figures
Scientific paper
10.1103/PhysRevB.81.155124
We report the high-resolution angle-resolved photoemission spectroscopy studies of electronic structure of EuFe2As2. The paramagnetic state data are found to be consistent with density-functional calculations. In the antiferromagnetic ordering state of Fe, our results show that the band splitting, folding, and hybridization evolve with temperature, which cannot be explained by a simple folding picture. Detailed measurements reveal that a tiny electron Fermi pocket and a tiny hole pocket are formed near (pi,pi) in the (0,0)-(pi,pi) direction, which qualitatively agree with the results of quantum oscillations, considering kz variation of Fermi surface. Furthermore, no noticeable change within the energy resolution is observed across the antiferromagnetic transition of Eu2+ ordering, suggesting weak coupling between Eu sublattice and FeAs sublattice.
Arita Masashi
Chen Fei
Chen Hua-Xing
Feng D. L.
He Cheng
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