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

TitlePersistent correlation between superconductivity and antiferromagnetic fluctuations near a nematic quantum critical point in FeSe1-xSx
Publication TypeJournal Article
Year of Publication2018
AuthorsWiecki, P, Rana, K, Bohmer, AE, Lee, Y, Bud'ko, SL, Canfield, PC, Furukawa, Y
JournalPhysical Review B
Volume98
Pagination020507
Date Published07
Type of ArticleArticle
ISBN Number2469-9950
Accession NumberWOS:000439973300002
Keywordsfese, order, physics, pressure, unconventional superconductivity
Abstract

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.

DOI10.1103/PhysRevB.98.020507
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Complex States

Alternate JournalPhys. Rev. B