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Coexistence of surface superconducting and three-dimensional topological dirac states in semimetal kznbi

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Title
Coexistence of surface superconducting and three-dimensional topological dirac states in semimetal kznbi
Author(s)
Junseong Song; Kim, Sunghun; Kim, Youngkuk; Fu, Huixia; Koo, Jahyun; Wang, Zhen; Lee, Gyubin; Lee, Jouhahn; Oh, Sang Ho; Bang, Joonho; Matsushita, Taku; Wada, Nobuo; Ikegami, Hiroki; Denlinger, Jonathan D.; Young Hee Lee; Yan, Binghai; Kim, Yeongkwan; Sung Wng Kim
Publication Date
2021-06
Journal
Physical Review X, v.11, no.2
Publisher
American Physical Society
Abstract
We report the discovery of a new three-dimensional (3D) topological Dirac semimetal (TDS) material KZnBi, coexisting with a naturally formed superconducting state on the surface under ambient pressure. Using photoemission spectroscopy together with first-principles calculations, a 3D Dirac state with linear band dispersion is identified. The characteristic features of massless Dirac fermions are also confirmed by magnetotransport measurements, exhibiting an extremely small cyclotron mass of m∗=0.012 m0 and a high Fermi velocity of vF=1.04×106 m/s. Interestingly, superconductivity occurs below 0.85 K on the (001) surface, while the bulk remains nonsuperconducting. The captured linear temperature dependence of the upper critical field suggests the possible non-s-wave character of this surface superconductivity. Our discovery serves a distinctive platform to study the interplay between 3D TDS and the superconductivity.
URI
https://pr.ibs.re.kr/handle/8788114/10077
DOI
10.1103/PhysRevX.11.021065
ISSN
2160-3308
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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