Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 25
  • Download : 0
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 x 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.
Publisher
AMER PHYSICAL SOC
Issue Date
2021-06
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW X, v.11, no.2

ISSN
2160-3308
DOI
10.1103/PhysRevX.11.021065
URI
http://hdl.handle.net/10203/286558
Appears in Collection
PH-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0