Robust determination of the superconducting gap sign structure via quasiparticle interference

被引：70

作者：

Hirschfeld, P. J. ^{[1
]}

Altenfeld, D. ^{[2
]}

Eremin, I. ^{[2
,3
]}

Mazin, I. I. ^{[4
]}

机构：

[1] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[2] Ruhr Univ Bochum, Inst Theoret Phys 2, D-44801 Bochum, Germany

[3] Kazan Fed Univ, Kazan 420008, Russia

[4] Naval Res Lab, Washington, DC 20375 USA

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 18期

基金：

美国国家科学基金会;

关键词：

WAVE; IMPURITIES; SCATTERING;

D O I：

10.1103/PhysRevB.92.184513

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Phase-sensitive measurements of the superconducting gap in Fe-based superconductors have proven more difficult than originally anticipated. While quasiparticle interference (QPI) measurements based on scanning tunneling spectroscopy are often proposed as definitive tests of gap structure, the analysis typically relies on details of the model employed. Here we point out that the temperature dependence of momentum-integrated QPI data can be used to identify gap sign changes in a qualitative way, and present an illustration for s(+/-) and s(++) states in a system with typical Fe-pnictide Fermi surface.

引用

页数：13

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