Impact of nematicity on the relationship between antiferromagnetic fluctuations and superconductivity in FeSe0.91S0.09 under pressure
| Autor: | Paul C. Canfield, Raquel A. Ribeiro, Yuji Furukawa, Sergey L. Bud'ko, G. G. Lesseux, Khusboo Rana, Paul W. Wiecki, Li Xiang, Anna E. Böhmer |
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| Rok vydání: | 2020 |
| Předmět: |
Quantum phase transition
Superconductivity Materials science Condensed matter physics Order (ring theory) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Liquid crystal Phase (matter) 0103 physical sciences Antiferromagnetism Fermi liquid theory 010306 general physics 0210 nano-technology Phase diagram |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.101.180503 |
| Popis: | 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. Our findings on FeSe$_{0.91}$S$_{0.09}$ were shown to be applied to the whole FeSe$_{1-x}$S$_{x}$ system and also provide a new insight into the relationship between AFM fluctuations and SC in Fe-based superconductors. |
| Databáze: | OpenAIRE |
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