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Two-dimensional multiband superconductivity of the optimally and uniformly Li-intercalated FeSe nanoflakes

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Title
Two-dimensional multiband superconductivity of the optimally and uniformly Li-intercalated FeSe nanoflakes
Author(s)
Yong Hyeon Kim; Sungyu Park; Chang Il Kwon; Kim, So Young; Watanabe, Kenji; Taniguchi, Takashi; Jun Sung Kim
Publication Date
2023-02
Journal
Current Applied Physics, v.46, pp.27 - 33
Publisher
The Korean Physical Society
Abstract
© 2022 Korean Physical SocietyWe investigated the electrical transport properties of optimally Li+-intercalated FeSe nanoflakes. Using solid electrolyte gating, we obtained high and uniform electron doping up to ∼0.55 electrons per Fe sites in the FeSe nanoflakes, which exhibit a sharp superconducting transition at Tc ∼45.0 K. The temperature and magnetic-field dependent current-voltage characteristics clearly revealed the two-dimensional nature of the superconductivity in the intercalated FeSe nanoflakes. From the self-field critical current measurements, we found two distinct isotropic superconducting gaps with different gap ratios. These findings suggest that the highly electron-doped FeSe hosts two interband pairing channels between the hybridized electron pockets, in contrast to the case of pristine FeSe with electron and hole pockets.
URI
https://pr.ibs.re.kr/handle/8788114/12437
DOI
10.1016/j.cap.2022.12.001
ISSN
1567-1739
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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