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

被引：57

作者：

Malaeb, Walid ^{[1
,2
]}

Yoshida, Teppei ^{[1
,2
,3
]}

Fujimori, Atsushi ^{[1
,2
]}

Kubota, Masato ^{[4
]}

Ono, Kanta ^{[4
]}

Kihou, Kunihiro ^{[5
]}

Shirage, Parasharam M. ^{[5
]}

Kito, Hijiri ^{[5
]}

Iyo, Akira ^{[3
,5
]}

Eisaki, Hiroshi ^{[3
,5
]}

Nakajima, Yasuyuki ^{[3
,6
]}

Tamegai, Tsuyoshi ^{[3
,6
]}

Arita, Ryotaro ^{[3
,6
]}

机构：

[1] Univ Tokyo, Dept Complex Sci & Engn, Bunkyo Ku, Tokyo 1130033, Japan

[2] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[3] JST, Transformat Res Project Iron Pnictides TRIP, Chiyoda Ku, Tokyo 1020075, Japan

[4] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[5] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[6] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2009年 / 78卷 / 12期

基金：

日本科学技术振兴机构;

关键词：

pnictides; three-dimensional electronic structure; ARPES; BA0.6K0.4FE2AS2;

D O I：

10.1143/JPSJ.78.123706

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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