Anisotropic superconductivity in the topological crystalline metal Pb1/3TaS2 with multiple Dirac fermions
Xiaohui Yang, Tonghua Yu, Chenchao Xu, Jialu Wang, Wanghua Hu, Zhuokai Xu, Tao Wang, Chao Zhang, Zhi Ren, Zhu-an Xu, Motoaki Hirayama, Ryotaro Arita, Xiao Lin
DOI 10.1103/PhysRevB.104.035157 · Physical Review B
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Abstract
Topological crystalline metals and semimetals (TCMs) have stimulated great research interest, which broadens the classification of topological phases and provides a valuable platform to explore topological superconductivity. Here, we report the discovery of superconductivity and topological features in Pb-intercalated transition-metal dichalcogenide Pb1/3TaS2. Systematic measurements indicate that Pb1/3TaS2 is a quasi-two-dimensional (q-2D) type-II superconductor (Tc≈2.8 K) with a significantly enhanced anisotropy of upper critical field (γHc2=Hc2ab/Hc2c≈17). In addition, first-principles calculations reveal that Pb1/3TaS2 hosts multiple topological Dirac fermions in the electronic band structure. We discover four groups of Dirac nodal lines on the kz=π plane and two sets of Dirac points on the rotation or screw axes, which are protected by crystalline symmetries and robust against spin-orbit coupling (SOC). Dirac-cone-like surface states emerge on the (001) surface because of band inversion. Our work shows that the TCM candidate Pb1/3TaS2 is a promising arena to study the interplay between superconductivity and topological Dirac fermions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb1/3TaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure not reported | midpoint |
| Pb1/3TaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.7 | Pressure not reported | onset |
| PbTaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.6 | Pressure not reported | unknown |
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