Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe
SCIE
SCOPUS
- Title
- Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe
- Authors
- Baek, Seung-Ho; Ok, Jong Mok; Kim, Jun Sung; Aswartham, Saicharan; Morozov, Igor; Chareev, Dmitriy; Urata, Takahiro; Tanigaki, Katsumi; Tanabe, Yoichi; Buechner, Bernd; Efremov, Dmitri V.
- Date Issued
- 2020-01
- Publisher
- NATURE PUBLISHING GROUP
- Abstract
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/106965
- DOI
- 10.1038/s41535-020-0211-y
- ISSN
- 2397-4648
- Article Type
- Article
- Citation
- NPJ QUANTUM MATERIALS, vol. 5, no. 1, 2020-01
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- There are no files associated with this item.
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