期刊
PHYSICAL REVIEW B
卷 102, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.205117
关键词
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资金
- Ministry of Science and Technology of China [2017YFA0302901, 2016YFA0300604, 2016YFA0300300, 2018YFE0202700]
- National Natural Science Foundation of China [U2032204, 12004416, 11761141013, 11888101, 11974391, 11974395, 11774399]
- Beijing Natural Science Foundation [Z180007, Z180008]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB33030100, XDB30000000]
- K. C. Wong Education Foundation [GJTD-201801]
We report the synthesis of single-crystal NbC, a transition metal carbide with various unusual properties. Transport, magnetic susceptibility, and specific heat measurements demonstrate that NbC is a conventional superconductor with a superconducting transition temperature (T-c) of 11.5 K. Our theoretical calculations show that NbC is a type-II Dirac semimetal with strong Fermi-surface nesting, which is supported by our angle-resolved photoemission spectroscopy (ARPES) measurement results. We also observed the superconducting gaps of NbC using ARPES and found some unconventional behaviors. These intriguing superconducting and topological properties, combined with the high corrosion resistance, make NbC an ideal platform for both fundamental research and device applications.
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