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Impact of nematicity on the relationship between antiferromagnetic fluctuations and superconductivity in FeSe$_{0.91}$ S$_{0.09}$ under pressure

Rana, K.; Xiang, L.; Wiecki, P.; Ribeiro, R. A.; Lesseux, G. G.; Böhmer, A. E.; Bud'ko, S. L.; Canfield, P. C.; Furukawa, Y.

The sulfur substituted FeSe system, FeSe$_{1−x}$S$_{x}$, provides a versatile platform for studying the relationship between nematicity, antiferromagnetism, and superconductivity. Here, by nuclear magnetic resonance (NMR) and resistivity measurements up to 4.73 GPa on FeSe$_{0.91}$S$_{0.09}$, we established the pressure(p)-temperature(T) phase diagram in which the nematic state is suppressed with pressure showing a nematic quantum phase transition (QPT) around p = 0.5 GPa, two SC regions, separated by the QPT, appear and antiferromagnetic (AFM) phase emerges above ∼3.3 GPa. From the NMR results up to 2.1 GPa, AFM fluctuations are revealed to be characterized by the stripe-type wavevector which remains the same for the two SC regions. Furthermore, the electronic state is found to change in character from non-Fermi liquid to Fermi liquid around the nematic QPT and persists up to ∼ 2.1 GPa. In addition, although the AFM fluctuations correlate with T$_{c}$ in both SC states, demonstrating the importance of the AFM fluctuations for the appearance of SC in the system, we found that, when nematic order is absent, T$_{c}$ is strongly correlated with the AFM fluctuations, whereas T$_{c}$ weakly depends on the AFM fluctuations when nematic order is present. ... mehr

Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Forschungsbericht/Preprint
Publikationsjahr 2020
Sprache Englisch
Identifikator KITopen-ID: 1000124979
Umfang 10 S.
Vorab online veröffentlicht am 06.05.2020
Nachgewiesen in arXiv
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