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Three-Dimensional Electronic Structure of Superconducting Iron Pnictides Observed by Angle-Resolved Photoemission Spectroscopy

Three-Dimensional Electronic Structure of Superconducting Iron Pnictides Observed by Angle-Resolved Photoemission Spectroscopy,10.1143/JPSJ.78.123706,

Three-Dimensional Electronic Structure of Superconducting Iron Pnictides Observed by Angle-Resolved Photoemission Spectroscopy   (Citations: 2)
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Walid Malaeb, Teppei Yoshida, Atsushi Fujimori, Masato Kubota, Kanta Ono, Kunihiro Kihou, Parasharam M. Shirage, Hijiri Kito, Akira Iyo, Hiroshi Eisaki, Yasuyuki Nakajima, Tsuyoshi Tamegaihttp://academic.research.microsoft.com/io.ashx?type=5&id=19516908&selfId1=0&selfId2=0&maxNumber=12&query=
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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