Physics – Condensed Matter – Superconductivity
Scientific paper
2009-06-10
J. Phys. Soc. Jpn. 78, 123706 (2009)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1143/JPSJ.78.123706
We have performed an angle-resolved photoemission spectroscopy (ARPES) study of the undoped and electron-doped iron pnictides BaFe2\_{-x}CoxAs2 (Ba122) (x=0, 0.14) and studied the Fermi surfaces (FSs) and band dispersions near the Fermi level. The FS sheets we observed are consistent with the shrinkage of the hole-like pockets around the Brillouin Zone (BZ) center and the expansion of the electron pockets around the BZ corner in the electron-doped compound as compared to the undoped parent compound. Band dispersions and FSs around the BZ center strongly depend on the photon energy, indicating the three-dimensional (3D) electronic structure. This observation suggests that the antiferromagnetism and superconductivity in the pnictides may have to be considered including the orbital-dependent 3D electronic structure, where FS nesting is not necessarily strong.
Arita Ryotaro
Eisaki Hiroshi
Fujimori Atsushi
Iyo Akira
Kihou Kunihiro
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