We present a study of the superconducting properties of the candidate topological Ti₃Sb, an A15 material recently realized to have non-trivial band topology. We report magneto-transport and penetration depth measurements to ³He temperatures and magnetization and calorimetry measurements to ⁴He temperatures, finding all techniques agree on the superconducting phase boundary. The observed low-temperature upper critical field, ~5 T, is well short of estimated Ginzburg-Landau behavior. Penetration depth measurements reveal a full superconducting gap.

Work by MPS, JD, was in part supported by the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists (WDTS) under the Visiting Faculty Program (VFP). Work by RC, WKK, JFM, UW was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

Keywords: Topological superconductor