Coexistence of Bulk Superconductivity and Charge Density Wave in CuxZrTe3

We report the coexistence of bulk superconductivity with T-c = 3.8 K and charge density wave (CDW) in Cu intercalated quasi-two-dimensional crystals of ZrTe3. The Cu intercalation results in the expansion of the unit cell orthogonal to the Zr-Zr metal chains and partial filling of CDW energy gap. We present anisotropic parameters of the superconducting state. We also show that the contribution of CDW to the scattering mechanism is anisotropic in the (a) over cap-(b) over cap plane. The dominant scattering mechanism in the normal state for both ZrTe3 and Cu0.05ZrTe3 along the (b) over cap axis is the electron-electron umklapp scattering.