Nematic Electronic Structure in the "Parent" State of the Iron-Based Superconductor Ca(Fe1-xCox)2As2

被引：447

作者：

Chuang, T. -M. ^{[1
,2
]}

Allan, M. P. ^{[1
,3
]}

Lee, Jinho ^{[1
,4
]}

Xie, Yang ^{[1
]}

Ni, Ni ^{[5
,6
]}

Bud'ko, S. L. ^{[5
,6
]}

Boebinger, G. S. ^{[2
]}

Canfield, P. C. ^{[5
,6
]}

Davis, J. C. ^{[1
,3
,4
,7
]}

机构：

[1] Cornell Univ, Atom & Solid State Phys Lab, Dept Phys, Ithaca, NY 14853 USA

[2] Florida State Univ, Dept Phys, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[3] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

[4] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

[5] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA

[6] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[7] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V5Z 1M9, Canada

来源：

SCIENCE | 2010年 / 327卷 / 5962期

基金：

英国工程与自然科学研究理事会;

关键词：

PHASES;

D O I：

10.1126/science.1181083

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The mechanism of high-temperature superconductivity in the newly discovered iron-based superconductors is unresolved. We use spectroscopic imaging-scanning tunneling microscopy to study the electronic structure of a representative compound CaFe1.94Co0.06As2 in the "parent" state from which this superconductivity emerges. Static, unidirectional electronic nanostructures of dimension eight times the inter-iron-atom distance a(Fe-Fe) and aligned along the crystal a axis are observed. In contrast, the delocalized electronic states detectable by quasiparticle interference imaging are dispersive along the b axis only and are consistent with a nematic alpha(2) band with an apparent band folding having wave vector (q) over right arrow congruent to +/- 2 pi/8a(Fe-Fe) along the a axis. All these effects rotate through 90 degrees at orthorhombic twin boundaries, indicating that they are bulk properties. As none of these phenomena are expected merely due to crystal symmetry, underdoped ferropnictides may exhibit a more complex electronic nematic state than originally expected.

引用

页码：181 / 184

页数：4

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