Enhanced anisotropic superconductivity in the topological nodal-line semimetal InxTaS2
Yupeng Li, Zongxiu Wu, Jingang Zhou, Kunliang Bu, Chenchao Xu, Lei Qiao, Miaocong Li, Hua Bai, Jiang Ma, Qian Tao, Chao Cao, Yi Yin, Zhu-An Xu
DOI 10.1103/PhysRevB.102.224503 · Physical Review B
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Abstract
Coexistence of topological bands and a charge density wave (CDW) in topological materials has attracted immense attention because of their fantastic properties, such as an axionic CDW, the three-dimensional quantum Hall effect, etc. In this work, the nodal-line semimetal InxTaS2 characterized by a CDW and superconductivity is successfully synthesized, whose structure and topological bands (two separated Weyl rings) are similar to In0.58TaSe2. A 2×2 commensurate CDW is observed at low temperature in InxTaS2, identified by transport properties and scanning tunneling microscopy measurements. Moreover, superconductivity emerges below 0.69 K, and the anisotropy ratio of the upper critical field [Γ=Hc2||ab(0)/Hc2||c(0)] is significantly enhanced compared to 2H-TaS2, which shares the same essential layer unit. According to the Lawrence-Doniach model, the enhanced Γ may be explained by the reduced effective mass in the kx−ky plane, where Weyl rings locate. Therefore, this type of layered topological systems may offer a platform to investigate highly anisotropic superconductivity and to understand the extremely large upper critical field in the bulk or in the two-dimensional limit.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| InxTaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.34 | Pressure not reported | midpoint |
| InxTaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.36 | Pressure not reported | midpoint |
| InxTaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.48 | Pressure not reported | midpoint |
| InxTaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.69 | Pressure not reported | midpoint |
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | unknown |
| In0.58TaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.91 | Pressure not reported | unknown |
| Na0.1TaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.3 | Pressure not reported | unknown |
| CuxTaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.03 | Pressure not reported | unknown |
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