Electron-hole asymmetry in the superconductivity of doped BaFe2As2 seen via the rigid chemical-potential shift in photoemission

被引：65

作者：

Neupane, M. ^{[1
]}

Richard, P. ^{[2
,3
,4
]}

Xu, Y. -M. ^{[1
]}

Nakayama, K. ^{[5
]}

Sato, T. ^{[5
]}

Takahashi, T. ^{[2
,5
]}

Federov, A. V. ^{[6
]}

Xu, G. ^{[3
,4
]}

Dai, X. ^{[3
,4
]}

Fang, Z. ^{[3
,4
]}

Wang, Z. ^{[1
]}

Chen, G. -F. ^{[1
]}

Wang, N. -L. ^{[3
,4
]}

Wen, H. -H. ^{[3
,4
]}

Ding, H. ^{[3
,4
]}

机构：

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

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

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

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

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

[6] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 09期

基金：

日本科学技术振兴机构; 美国国家科学基金会; 日本学术振兴会;

关键词：

BA0.6K0.4FE2AS2;

D O I：

10.1103/PhysRevB.83.094522

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed a systematic photoemission study of the chemical-potential shift as a function of carrier doping in a pnictide system based on BaFe2As2. The experimentally determined chemical-potential shift is consistent with the prediction of a rigid band shift picture by renormalized first-principle band calculations. This leads to an electron-hole asymmetry (EHA) in the Fermi surface (FS) nesting condition due to different effective masses for different FS sheets, which can be calculated from the Lindhard function of susceptibility. This built-in EHA, which matches well the observed asymmetric superconducting domes in the phase diagram, strongly supports FS quasinesting driven superconductivity in iron pnictides.

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页数：6

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