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arXiv · 2011.06740

Enhanced anisotropic superconductivity in the topological nodal-line semimetal InxTaS2

Yupeng Li·Zhongxiu Wu·Jingang Zhou·Kunliang Bu·Chenchao Xu·Lei Qiao·Miaocong Li·Hua Bai·Jiang Ma·Qian Tao·Chao Cao·Yi Yin·Zhu-An Xu
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Abstract

Coexistence of topological bands and charge density wave (CDW) in topological materials has attracted immense attentions because of their fantastic properties, such as axionic-CDW, three-dimensional quantum Hall effect, etc. In this work, a nodal-line semimetal InxTaS2 characterized by CDW and superconductivity is successfully synthesized, whose structure and topological bands (two separated Wely rings) are similar to In0.58TaSe2. A 2 x 2 commensurate CDW is observed at low temperature in InxTaS2, identified by transport properties and STM measurements. Moreover, superconductivity emerges below 0.69 K, and the anisotropy ratio of upper critical field [Gamma = H||ab c2(0)=H||c c2(0)] is significantly enhanced compared to 2H-TaS2, which shares the same essential layer unit. According to the Lawrence-Doniach model, the enhanced Gamma may be explained by the reduced effective mass in 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.

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Yupeng Li, Zhongxiu Wu, Jingang Zhou, Kunliang Bu, Chenchao Xu, Lei Qiao, Miaocong Li, Hua Bai, Jiang Ma, Qian Tao, Chao Cao, Yi Yin, Zhu-An Xu. 2020-11-13. Enhanced anisotropic superconductivity in the topological nodal-line semimetal InxTaS2. https://doi.org/10.1103/physrevb.102.224503

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