Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi
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 wit...
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American Physical Society
2021
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oai:doaj.org-article:9551a0a5cb9244b2ad254300c638487a2021-12-02T17:09:45ZCoexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi10.1103/PhysRevX.11.0210652160-3308https://doaj.org/article/9551a0a5cb9244b2ad254300c638487a2021-06-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.021065http://doi.org/10.1103/PhysRevX.11.021065https://doaj.org/toc/2160-3308We 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 m_{0} and a high Fermi velocity of v_{F}=1.04×10^{6} 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.Junseong SongSunghun KimYoungkuk KimHuixia FuJahyun KooZhen WangGyubin LeeJouhahn LeeSang Ho OhJoonho BangTaku MatsushitaNobuo WadaHiroki IkegamiJonathan D. DenlingerYoung Hee LeeBinghai YanYeongkwan KimSung Wng KimAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 2, p 021065 (2021) |
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Physics QC1-999 |
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Physics QC1-999 Junseong Song Sunghun Kim Youngkuk Kim Huixia Fu Jahyun Koo Zhen Wang Gyubin Lee Jouhahn Lee Sang Ho Oh Joonho Bang Taku Matsushita Nobuo Wada Hiroki Ikegami Jonathan D. Denlinger Young Hee Lee Binghai Yan Yeongkwan Kim Sung Wng Kim Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi |
| description |
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 m_{0} and a high Fermi velocity of v_{F}=1.04×10^{6} 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. |
| format |
article |
| author |
Junseong Song Sunghun Kim Youngkuk Kim Huixia Fu Jahyun Koo Zhen Wang Gyubin Lee Jouhahn Lee Sang Ho Oh Joonho Bang Taku Matsushita Nobuo Wada Hiroki Ikegami Jonathan D. Denlinger Young Hee Lee Binghai Yan Yeongkwan Kim Sung Wng Kim |
| author_facet |
Junseong Song Sunghun Kim Youngkuk Kim Huixia Fu Jahyun Koo Zhen Wang Gyubin Lee Jouhahn Lee Sang Ho Oh Joonho Bang Taku Matsushita Nobuo Wada Hiroki Ikegami Jonathan D. Denlinger Young Hee Lee Binghai Yan Yeongkwan Kim Sung Wng Kim |
| author_sort |
Junseong Song |
| title |
Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi |
| title_short |
Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi |
| title_full |
Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi |
| title_fullStr |
Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi |
| title_full_unstemmed |
Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi |
| title_sort |
coexistence of surface superconducting and three-dimensional topological dirac states in semimetal kznbi |
| publisher |
American Physical Society |
| publishDate |
2021 |
| url |
https://doaj.org/article/9551a0a5cb9244b2ad254300c638487a |
| work_keys_str_mv |
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| _version_ |
1718381512621031424 |