Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
Three-Dimensional Electronic Structure of Superconducting Iron Pnictides Observed by Angle-Resolved Photoemission Spectroscopy
Walid MalaebTeppei YoshidaAtsushi FujimoriMasato KubotaKanta OnoKunihiro KihouParasharam M. ShirageHijiri KitoAkira IyoHiroshi EisakiYasuyuki NakajimaTsuyoshi TamegaiRyotaro Arita
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2009 Volume 78 Issue 12 Pages 123706


We have performed an angle-resolved photoemission spectroscopy (ARPES) study of the undoped and electron-doped iron pnictides BaFe2−xCoxAs2 (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 a three-dimensional (3D) electronic structure. This observation suggests that antiferromagnetism and superconductivity in the pnictides have to be described in terms of an orbital-dependent 3D electronic structure, where FS nesting is not necessarily strong.

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© The Physical Society of Japan 2009
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