Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi
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
DOI 10.1103/PhysRevX.11.021065 · Physical Review X
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
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 m0 and a high Fermi velocity of vF=1.04×106 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KZnBi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.85 | Pressure unresolved | zero_resistance |
| KZnBi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| KZnBi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
Similar papers
Observation of superconductivity in 3D Dirac semimetal Cd3As2 crystal
similarity 0.89He Wang et al. · 2015 · arXiv:1501.00418
Source status unknown — claims are unverified
Coexistence of Topological Surface States and Superconductivity in Dirac Semimetal NiTe2
similarity 0.89Chen He et al.
Source status unknown — claims are unverified
Superconductivity and a van Hove singularity confined to the surface of a topological semimetal
similarity 0.88Md Shafayat Hossain et al. · 2025 · arXiv:2502.09878
Source status unknown — claims are unverified
Orbital-designed flat-band model and realization of superconductivity in three-dimensional materials
similarity 0.88Yueshao Zheng et al.
Source status unknown — claims are unverified
Topological Dirac surface states and superconducting pairing correlations in PbTaSe2
similarity 0.88Tay-Rong Chang et al.
Source status unknown — claims are unverified
Gapless spin excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor
similarity 0.88Keith M. Taddei et al.
Source status unknown — claims are unverified