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.
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页数：6
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