Superconductivity in Nb .95Ta .05Se 3

We have measured the resistivity of NbSe ₃ doped with 5% Ta from room temperature down to 0.5K and compared our results with similar measurements on pure NbSe ₃. The pure sample remains normal to the lowest temperature (0.5K), whereas the doped sample has a sharp transition to the superconducting state with T _c = 1.5 ± 0.2 K. Measurements of the critical magnetic field indicate that the Ta doped samples are homogeneous, anisotropic three dimensional superconductors.