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

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arxiv 0904.1632 v2 pith:QKUSL2QZ submitted 2009-04-10 cond-mat.supr-con cond-mat.str-el

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

T. Shimojima , K. Ishizaka , Y. Ishida , N. Katayama , K. Ohgushi , T. Kiss , M. Okawa , T. Togashi
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X. -Y. Wang C. -T. Chen S. Watanabe R. Kadota T. Oguchi A. Chainani S. Shin
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classification cond-mat.supr-con cond-mat.str-el
keywords electronicstructureacrossbafe2as2magneto-structuraltransitionarpesband
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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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