Lattice-shifted nematic quantum critical point in FeSe1-xSx

被引：14
|
作者：
Chibani, S. [1 ]
Farina, D. [1 ]
Massat, P. [1 ]
Cazayous, M. [1 ]
Sacuto, A. [1 ]
Urata, T. [2 ,9 ]
Tanabe, Y. [2 ,3 ]
Tanigaki, K. [2 ,4 ]
Boehmer, A. E. [5 ,6 ,10 ]
Canfield, P. C. [6 ,7 ]
Merz, M. [5 ]
Karlsson, S. [8 ]
Strobel, P. [8 ]
Toulemonde, P. [8 ]
Paul, I [1 ]
Gallais, Y. [1 ]
机构：
[1] Univ Paris, CNRS, Mat & Phenomenes Quant, Paris, France
[2] Tohoku Univ, Grad Sch Sci, Dept Phys, Sendai, Miyagi, Japan
[3] Okayama Univ Sci, Dept Appl Sci, Okayama, Japan
[4] Tohoku Univ, Adv Inst Mat Res, Sendai, Miyagi, Japan
[5] Karlsruhe Inst Technol, Inst Quantum Mat & Technol, Karlsruhe, Germany
[6] Iowa State Univ, Ames Lab, US DOE, Ames, IA USA
[7] Iowa State Univ, Dept Phys & Astron, Ames, IA USA
[8] Univ Grenoble Alpes, CNRS, Grenoble INP, Inst Neel, Grenoble, France
[9] Nagoya Univ, Dept Mat Phys, Chikusa Ku, Nagoya, Aichi, Japan
[10] Ruhr Univ Bochum, Expt Phys 4, Bochum, Germany
来源：
NPJ QUANTUM MATERIALS | 2021年 / 6卷 / 01期
关键词：
RAMAN-SCATTERING; MAGNETIC ORDER; SUPERCONDUCTIVITY; FLUCTUATIONS; SUSCEPTIBILITY; FRUSTRATION; FESE; DOME;
D O I：
10.1038/s41535-021-00336-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report the evolution of nematic fluctuations in FeSe1-xSx single crystals as a function of Sulfur content x across the nematic quantum critical point (QCP) x(c) similar to 0.17 via Raman scattering. The Raman spectra in the B-1g nematic channel consist of two components, but only the low energy one displays clear fingerprints of critical behavior and is attributed to itinerant carriers. Curie-Weiss analysis of the associated nematic susceptibility indicates a substantial effect of nemato-elastic coupling, which shifts the location of the nematic QCP. We argue that this lattice-induced shift likely explains the absence of any enhancement of the superconducting transition temperature at the QCP. The presence of two components in the nematic fluctuations spectrum is attributed to the dual aspect of electronic degrees of freedom in Hund's metals, with both itinerant carriers and local moments contributing to the nematic susceptibility.
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页数：8
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