Three-Dimensional Electronic Structure of Superconducting Iron Pnictides Observed by Angle-Resolved Photoemission Spectroscopy
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概要
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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.
- 2009-12-15
著者
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SHIRAGE Parasharam
National Institute of Advanced Industrial Science and Technology
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KIHOU Kunihiro
National Institute of Advanced Industrial Science and Technology
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IYO Akira
JST, TRIP
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EISAKI Hiroshi
JST, TRIP
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Kito Hijiri
National Inst. Advanced Industrial Sci. And Technol. (aist) Ibaraki Jpn
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Ono Kanta
Institute For Material Structure Science High Energy Accelerator Research Organization
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Kubota Masato
Institute For Material Structure Science High Energy Accelerator Research Organization
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Yoshida Teppei
Department Of Physics Applied Physics And Stanford Synchrotron Radiation Laboratory Stanford Univers
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Fujimori Atsushi
Department Of Complexity Science And Engineering And Department Of Physics University Of Tokyo
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Malaeb Walid
Department Of Complexity Science And Engineering And Department Of Physics University Of Tokyo
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Tamegai Tsuyoshi
JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075
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Ono Kanta
Institute for Material Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801
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Arita Ryotaro
JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075
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Nakajima Yasuyuki
JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075
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Fujimori Atsushi
Department of Complexity Science and Engineering and Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033
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Iyo Akira
JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075
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Yoshida Teppei
Department of Complexity Science and Engineering and Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033
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Shirage Parasharam
National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568
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Eisaki Hiroshi
JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075
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