Orbital-dependent modifications of electronic structure across magneto-structural transition in BaFe2As2

Details Orbital-dependent modifications of electronic structure across magneto-structural transition in BaFe2As2 Orbital-dependent modifications of electronic structure across magneto-structural transition in BaFe2As2

2009-04-10

arxiv.org/abs/0904.1632v2

Phys. Rev. Lett. 104, 057002 (2010)

Physics

Condensed Matter

Superconductivity

13 pages, 4 figures. accepted by Physical Review Letters

Scientific paper

Laser angle-resolved photoemission spectroscopy (ARPES) is employed to investigate the temperature (T) dependence of the electronic structure in BaFe2As2 across the magneto-structural transition at TN ~ 140 K. A drastic transformation in Fermi surface (FS) shape across TN is observed, as expected by first-principles band calculations. Polarization-dependent ARPES and band calculations consistently indicate that the observed FSs at kz ~ pi in the low-T antiferromagnetic (AF) state are dominated by the Fe3dzx orbital, leading to the two-fold electronic structure. These results indicate that magneto-structural transition in BaFe2As2 accompanies orbital-dependent modifications in the electronic structure.

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