Band Structure and Fermi Surface of an Extremely Overdoped Iron-Based Superconductor KFe2As2

被引：193

作者：

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

Nakayama, K. ^{[1
]}

Sekiba, Y. ^{[1
]}

Richard, P. ^{[3
]}

Xu, Y. -M. ^{[4
]}

Souma, S. ^{[3
]}

Takahashi, T. ^{[1
,3
]}

Chen, G. F. ^{[5
,6
]}

Luo, J. L. ^{[5
,6
]}

Wang, N. L. ^{[5
,6
]}

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

机构：

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

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

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

[4] Boston Coll, Dept Phys, Chestnut Hill, MA 02167 USA

[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

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 04期

基金：

美国国家科学基金会;

关键词：

ELECTRONIC-STRUCTURE; ORDER; GAPS;

D O I：

10.1103/PhysRevLett.103.047002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have performed high-resolution angle-resolved photoemission spectroscopy on heavily overdoped KFe2As2 (transition temperature T-c = 3 K). We observed several renormalized bands near the Fermi level with a renormalization factor of 2-4. While the Fermi surface around the Brillouin-zone center is qualitatively similar to that of optimally doped Ba1-xKxFe2As2 (x = 0.4; T-c = 37 K), the Fermi surface topology around the zone corner (M point) is markedly different: the two electron Fermi surface pockets are completely absent due to an excess of hole doping. This result indicates that the electronic states around the M point play an important role in the high-T-c superconductivity of Ba1-xKxFe2As2 and suggests that the interband scattering via the antiferromagnetic wave vector essentially controls the Tc value in the overdoped region.

引用

页数：4

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