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Title: Persistent Correlation between Superconductivity and Antiferromagnetic Fluctuations near a Nematic Quantum Critical Point in FeSe1-xSx

Journal Article · · Physical Review B
 [1];  [1];  [2];  [1];  [1];  [1];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Karlsruhe Inst. of Technology (KIT) (Germany). Inst. fur Festkörperphysik

Here, we present 77Se-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 Tc 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.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1464474
Alternate ID(s):
OSTI ID: 1461910
Report Number(s):
IS-J-9716; PRBMDO; TRN: US1902389
Journal Information:
Physical Review B, Vol. 98, Issue 2; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Nematic pairing from orbital-selective spin fluctuations in FeSe journal November 2018
Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition journal January 2019
Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe journal January 2020
Quenched nematic criticality and two superconducting domes in an iron-based superconductor journal October 2019
Coexistence of orbital and quantum critical magnetoresistance in FeSe 1 − x S x journal September 2019