Abstract
Superconductivity in the new compound, MgTa2S5, is reported. Its crystal structure was indexed to space group C2/m, which is monoclinic with lattice parameters a = 5.784(5) Å, b = 12.680(3) Å, and c = 6.106(5) Å, with β = 112.64∘. Electrical resistivity reveals metallic behavior with ρ(296 K) = 5.2 mΩ cm and bulk superconductivity below Tc = 1 K. Measurements of the specific heat C reveal the electronic specific heat coefficient γ = 11.1(5) mJ/mol K2, a jump in C at Tc illustrating bulk superconductivity, and an energy gap associated with the superconducting state of Eg = 0.25(3) meV. MgTa2S5 can be classified as a BCS superconductor. An unidentified minority phase present in the sample (∼ 4%) exhibits a superconducting phase transition near 2.6 K.
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