Electronic structure of heavily electron-doped BaFe1.7Co0.3As2 studied by angle-resolved photoemission

被引：115

作者：

Sekiba, Y. ^{[1
]}

Sato, T. ^{[1
,2
]}

Nakayama, K. ^{[1
]}

Terashima, K. ^{[3
]}

Richard, P. ^{[4
]}

Bowen, J. H. ^{[5
,6
]}

Ding, H. ^{[5
,6
]}

Xu, Y-M ^{[7
]}

Li, L. J. ^{[8
]}

Cao, G. H. ^{[8
]}

Xu, Z-A ^{[8
]}

Takahashi, T. ^{[1
,4
]}

机构：

[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[2] Japan Sci & Technol Agcy, TRIP, Kawaguchi, Saitama 3320012, Japan

[3] Inst Mol Sci, UVSOR Facil, Okazaki, Aichi 4448585, Japan

[4] Tohoku Univ, WPI Res Ctr, Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

[5] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[6] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[7] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[8] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

来源：

NEW JOURNAL OF PHYSICS | 2009年 / 11卷

基金：

美国国家科学基金会;

关键词：

NODELESS SUPERCONDUCTING GAPS; LAO1-XFXFEAS; COMPOUND;

D O I：

10.1088/1367-2630/11/2/025020

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have performed high-resolution angle-resolved photo-emission spectroscopy on heavily electron-doped non-superconducting (SC) BaFe1.7Co0.3As2. We find that the two hole Fermi surface pockets at the Brillouin zone center observed in the hole-doped superconducting Ba0.6K0.4Fe2As2 are absent or very small in this compound, while the two electron pockets at the zone corner significantly expand due to electron doping by the Co substitution. Comparison of the Fermi surface between non-SC and SC samples indicates that the coexistence of hole and electron pockets connected via the antiferromagnetic wave vector is essential in realizing the mechanism of superconductivity in the iron-based superconductors.

引用

页数：8

共 27 条

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