期刊
NPJ QUANTUM MATERIALS
卷 5, 期 1, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41535-020-0211-y
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资金
- Deutsche Forschungsgemeinschaft (Germany) [BA 4927/2-1]
- National Research Foundation of Korea [NRF-2019R1F1A1057463]
- RSF-DFG project [19-43-04129, BU887/25-1, EF86/7-1]
- VW foundation
- Deutsche Forschungsgemeinschaft (DFG) [DFG AS 523/4-1]
- Institute for Basic Science [IBS-R014-D1]
- National Research Foundation (NRF) of Korea through the SRC [2018R1A5A6075964]
- Max Planck-POSTECH Center for Complex Phase Materials in Korea (MPK) [2016K1A4A4A01922028]
- program 211 of the Russian Federation Government [02.A03.21.0006]
- Russian Government Program of Competitive Growth of Kazan Federal University
- Russian Science Foundation [19-43-04129] Funding Source: Russian Science Foundation
The interplay of orbital and spin degrees of freedom is the fundamental characteristic in numerous condensed matter phenomena, including high-temperature superconductivity, quantum spin liquids, and topological semimetals. In iron-based superconductors (FeSCs), this causes superconductivity to emerge in the vicinity of two other instabilities: nematic and magnetic. Unveiling the mutual relationship among nematic order, spin fluctuations, and superconductivity has been a major challenge for research in FeSCs, but it is still controversial. Here, by carrying out Se-77 nuclear magnetic resonance (NMR) measurements on FeSe single crystals, doped by cobalt and sulfur that serve as control parameters, we demonstrate that the superconducting transition temperature T-c increases in proportion to the strength of spin fluctuations, while it is independent of the nematic transition temperature T-nem. Our observation therefore directly implies that superconductivity in FeSe is essentially driven by spin fluctuations in the intermediate coupling regime, while nematic fluctuations have a marginal impact on T-c.
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