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Ok, Jong Mok
원자제어 저차원 전자계 연구단
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Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe

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Title
Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe
Author(s)
Baek, Seung-Ho; Jong Mok Ok; Jun Sung Kim; Aswartham, Saicharan.; Morozov, Igor; Chareev, Dmitriy; Urata, Takahiro; Tanigaki, Katsumi; Tanabe, Yoichi; Buechner, Bernd; Efremov, Dmitri V.
Subject
SINGLE-CRYSTAL GROWTH, ; NORMAL-STATE, ; ORDER, ; MODEL
Publication Date
2020-01
Journal
NPJ QUANTUM MATERIALS, v.5, no.1, pp.8
Publisher
NATURE PUBLISHING GROUP
Abstract
© 2020, The Author(s). 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 77Se 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 Tc increases in proportion to the strength of spin fluctuations, while it is independent of the nematic transition temperature Tnem. 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 Tc
URI
https://pr.ibs.re.kr/handle/8788114/8735
DOI
10.1038/s41535-020-0211-y
ISSN
2397-4648
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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