Nematic-Fluctuation-Mediated Superconductivity Revealed by Anisotropic Strain in Ba(Fe1-xCox )2As2

被引：1

作者：

Philippe, Jean-Come ^{[1
]}

Lespinas, Alexis ^{[1
]}

Faria, Jimmy ^{[1
]}

Forget, Anne ^{[2
]}

Colson, Dorothee ^{[2
]}

Houver, Sarah ^{[1
]}

Cazayous, Maximilien ^{[1
]}

Sacuto, Alain ^{[1
]}

Paul, Indranil ^{[1
]}

Gallais, Yann ^{[1
]}

机构：

[1] Univ Paris Cite, Mat & Phinomenes Quant, UMR CNRS 7162, Batiment Condorcet, F-75205 Paris 13, France

[2] CEA Saclay, DSM DRECAM SPEC, Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW LETTERS | 2022年 / 129卷 / 18期

关键词：

QUANTUM CRITICAL-POINT; SUSCEPTIBILITY; CRITICALITY; ORDER;

D O I：

10.1103/PhysRevLett.129.187002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Anisotropic strain is an external field capable of selectively addressing the role of nematic fluctuations in promoting superconductivity. We demonstrate this using polarization-resolved elasto-Raman scattering by probing the evolution of nematic fluctuations under strain in the normal and superconducting state of the paradigmatic iron-based superconductor a(Fe1 - xCox )(2)As-2 . In the parent compound BaFe2As2 we observe a strain-induced suppression of the nematic susceptibility which follows the expected behavior of an Ising order parameter under a symmetry breaking field. For the superconducting compound, the suppression of the nematic susceptibility correlates with the decrease of the critical temperature T-c, indicating a significant contribution of nematic fluctuations to electron pairing. Our results validate theoretical scenarios of enhanced T-c near a nematic quantum critical point.

引用

页数：6

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