Electronic Dispersion Anomalies in Iron Pnictide Superconductors

被引：8

作者：

Heimes, Andreas ^{[1
,4
]}

Grein, Roland ^{[1
,2
]}

Eschrig, Matthias ^{[1
,2
,3
,4
]}

机构：

[1] Karlsruhe Inst Technol, Inst Theoret Festkorperphys, D-76131 Karlsruhe, Germany

[2] Karlsruhe Inst Technol, DFG Ctr Funct Nanostruct, D-76128 Karlsruhe, Germany

[3] Univ Konstanz, Fachbereich Phys, D-78457 Constance, Germany

[4] Univ London, SEPnet & Hubbard Theory Consortium, Dept Phys, Egham TW20 0EX, Surrey, England

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 04期

关键词：

T-C; BA0.6K0.4FE2AS2;

D O I：

10.1103/PhysRevLett.106.047003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recently, experimental studies of the spin excitation spectrum revealed a strong temperature dependence in the normal state and a resonance feature in the superconducting state of several Fe-based superconductors. Based on these findings, we develop a model of electrons interacting with a temperature dependent magnetic excitation spectrum and apply it to angle resolved photoemission in Ba1-xKxFe2As2. We reproduce in quantitative agreement with experiment a renormalization of the quasiparticle dispersion both in the normal and the superconducting state, and the dependence of the quasiparticle linewidth on binding energy. We estimate the strength of the coupling between electronic and spin excitations. Our findings support a dominantly magnetic pairing mechanism.

引用

页数：4

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