Persistent correlation between superconductivity and antiferromagnetic fluctuations near a nematic quantum critical point in FeSe1-xSx

被引：41
|
作者：
Wiecki, P. [1 ,2 ]
Rana, K. [1 ,2 ]
Boehmer, A. E. [1 ,2 ,3 ]
Lee, Y. [1 ,2 ]
Bud'ko, S. L. [1 ,2 ]
Canfield, P. C. [1 ,2 ]
Furukawa, Y. [1 ,2 ]
机构：
[1] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA
[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
[3] Karlsruhe Inst Technol, Inst Festkorperphys, D-76021 Karlsruhe, Germany
来源：
PHYSICAL REVIEW B | 2018年 / 98卷 / 02期
关键词：
UNCONVENTIONAL SUPERCONDUCTIVITY; FESE; PRESSURE; ORDER;
D O I：
10.1103/PhysRevB.98.020507
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present Se-77-NMR measurements on FeSe1-xSx samples with sulfur content x = 0%, 9%, 15%, and 29%. Twinned nematic domains are observed in the NMR spectrum for all samples except x = 29%. The NMR spin-lattice relaxation rate shows that antiferromagnetic (AFM) fluctuations are initially enhanced between x = 0% and x = 9%, but are strongly suppressed for higher x values. The observed behavior of the AFM fluctuations parallels the superconducting transition temperature T-c in these materials, providing strong evidence for the primary importance of AFM fluctuations for superconductivity, despite the presence of nematic quantum criticality in the FeSe1-xSx system.
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页数：6
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