Observation of Dirac Cone Electronic Dispersion in BaFe2As2

被引：213

作者：

Richard, P. ^{[1
]}

Nakayama, K. ^{[2
]}

Sato, T. ^{[2
,3
]}

Neupane, M. ^{[4
]}

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

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

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

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

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

Dai, X. ^{[5
,6
]}

Fang, Z. ^{[5
,6
]}

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

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

机构：

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

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

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

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

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

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

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 13期

关键词：

FERMI-SURFACE; BA0.6K0.4FE2AS2;

D O I：

10.1103/PhysRevLett.104.137001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We performed an angle-resolved photoemission spectroscopy study of BaFe2As2, which is the parent compound of the so-called 122 phase of the iron-pnictide high-temperature superconductors. We reveal the existence of a Dirac cone in the electronic structure of this material below the spin-density-wave temperature, which is responsible for small spots of high photoemission intensity at the Fermi level. Our analysis suggests that the cone is slightly anisotropic and its apex is located very near the Fermi level, leading to tiny Fermi surface pockets. The bands forming the cone show an anisotropic leading edge gap away from the cone that suggests a nodal spin-density-wave description.

引用

页数：4

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