Superconducting properties and gap structure of the topological superconducting candidate Ti3Sb

Nov. 30 12:15-12:30

*Hendrik Hebbeker1, Matt Smylie1,2, Jared Dans1, Ramakanta Chapai2, Wai-Kwong Kwok2, John Mitchell2, Ulrich Welp2
Department of Physics and Astronomy, Hofstra University, USA1
Materials Science Division, Argonne National Laboratory, USA2

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