  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.
