Ta5GeB2: New T2 superconductor phase

• It is shown demonstrated that B can substitute Ge atoms in the Ta5GeB2phase.
• It is shown demonstrated that Ta5GeB2has a Cr5B3 prototype structure.
• Ta5GeB2 is a new example of stoichiometric Cr5B3phase.
• Ta5GeB2 is found to be a new superconductor at 3.8 K.
• Ta5GeB2 is a BCS superconductor.

We report superconductivity at TC ∼3.8 K in the new ternary phase Ta5GeB2. Bulk superconductivity is confirmed by magnetization, electrical resistivity and heat capacity measurements, the results showing conventional bulk superconductivity. Ta5GeB2 is a further example of a stoichiometric T2 phase with Cr5B3 prototype structure.