Superconducting properties of Ta<sub>3</sub>Sb and Ti<sub>3</sub>Sb, A15 compounds which are candidate topological superconductors

ORAL

Abstract

We present a study of the superconducting properties of polycrystalline Ti3Sb (Tc ~ 5.9 K) and Ta3Sb (Tc ~ 0.67 K), candidate topological superconductors of the A15 family. Via magneto-transport, magnetization and calorimetry measurements, we determine the superconducting phase diagram for both compounds and find large Ginsburg-Landau parameters for both Ti3Sb (κ = 55) and Ta3Sb (κ = 90) , identifying them as extremely type-II superconductors. Calorimetry and London penetration depth measurements at 3He temperatures are consistent with a full BCS-like superconducting gap in both compounds.

*Synthesis, magnetization, TDO, and magneto-transport was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. Calorimetry was supported by the Swedish Research Council Formas, D. Nr. 2021-04360. Work 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).

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Presenters

  • Matthew P Smylie

    • Hofstra University

Authors

  • Matthew P Smylie

    • Hofstra University

  • Ramakanta Chapai

    • Argonne National Laboratory

  • Andreas Rydh

    • Stockholm University

  • Jared Z Dans

    • Hofstra University

  • Hendrik Hebbeker

    • Hofstra University

  • Duck Young Y Chung

    • Argonne National Laboratory

  • Hong Zheng

    • Argonne National Laboratory

  • Alexei E Koshelev

    • Argonne National Laboratory

  • John Pearson

    • Argonne National Laboratory

  • Wai-Kwong Kwok

    • Argonne National Laboratory

  • John F Mitchell

    • Argonne National Laboratory

  • Ulrich Welp

    • Argonne National Laboratory