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Superconductivity and Fermi Surface Nesting in the Candidate Dirac Semimetal NbC

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arxiv 2010.14259 v2 pith:LUWVMSPG submitted 2020-10-27 cond-mat.supr-con cond-mat.mtrl-sci

Superconductivity and Fermi Surface Nesting in the Candidate Dirac Semimetal NbC

classification cond-mat.supr-con cond-mat.mtrl-sci
keywords superconductingarpesdiracferminestingpropertiessemimetalsurface
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 ARPES measurement results. We also observed the superconducting gaps of NbC using angle-resolved photoemission spectroscopy (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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