| Autor: |
Young Hee Lee, Huixia Fu, Youngkuk Kim, Sunghun Kim, Jonathan D. Denlinger, Taku Matsushita, Zhen Wang, Hiroki Ikegami, Binghai Yan, Sung Wng Kim, Gyubin Lee, Junseong Song, Jahyun Koo, Sang Ho Oh, Yeongkwan Kim, Joonho Bang, Nobuo Wada, Jouhahn Lee |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Physical Review X, Vol 11, Iss 2, p 021065 (2021) |
| ISSN: |
2160-3308 |
| DOI: |
10.1103/physrevx.11.021065 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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