Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron based superconductors probed by the Nernst effect

被引：1

作者：

Wuttke, Christoph ^{[1
]}

Caglieris, Federico ^{[1
,2
]}

Sykora, Steffen ^{[1
,3
]}

Steckel, Frank ^{[1
]}

Hong, Xiaochen ^{[1
,4
]}

Ran, Sheng ^{[5
,6
,7
]}

Khim, Seunghyun ^{[1
,8
]}

Kappenberger, Rhea ^{[1
]}

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

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

Wurmehl, Sabine ^{[1
]}

Aswartham, Saicharan ^{[1
]}

Buechner, Bernd ^{[1
,9
,10
]}

Hess, Christian ^{[1
,4
,9
]}

机构：

[1] IFW Dresden, Leibniz Inst Solid State & Mat Res, D-01069 Dresden, Germany

[2] CNR SPIN, I-16152 Genoa, Italy

[3] Tech Univ Dresden, Inst Theoret Phys, D-01069 Dresden, Germany

[4] Berg Universitht Wuppertal, Fak Math & Nat Wissensch, D-42097 Wuppertal, Germany

[5] Ames Lab, Ames, IA 50011 USA

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

[7] Washington Univ, Dept Phys, St Louis, MO 63130 USA

[8] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[9] Tech Univ Dresden, Ctr Transport & Devices, D-01069 Dresden, Germany

[10] Tech Univ Dresden, Inst Festkorperphys, D-01069 Dresden, Germany

来源：

NPJ QUANTUM MATERIALS | 2022年 / 7卷 / 01期

基金：

欧洲研究理事会;

关键词：

STATE; ORDER;

D O I：

10.1038/s41535-022-00487-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The role of nematic fluctuations for unconventional superconductivity has been the subject of intense discussions for many years. In iron-based superconductors, the most established probe for electronic-nematic fluctuations, i.e. the elastoresistivity seems to imply that superconductivity is reinforced by electronic-nematic fluctuations, since the elastoresistivity amplitude peaks at or close to optimal T-c. However, on the over-doped side of the superconducting dome, the diminishing elastoresistivity suggests a negligible importance in the mechanism of superconductivity. Here we introduce the Nernst coefficient as a genuine probe for electronic nematic fluctuations, and we show that the amplitude of the Nernst coefficient tracks the superconducting dome of two prototype families of iron-based superconductors, namely Rh-doped BaFe2As2 and Co-doped LaFeAsO. Our data thus provide fresh evidence that in these systems, nematic fluctuations foster the superconductivity throughout the phase diagram.

引用

页数：10

共 41 条

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