Superconductivity of Ta-Hf and Ta-Zr alloys: Potential alloys for use in superconducting devices

Tomasz Klimczuk, Szymon Królak, Robert J. Cava

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The electronic properties relevant to superconductivity are reported for bulk Ta-Hf and Ta-Zr body centered cubic alloys, in a large part to determine whether their properties are suitable for potential use in superconducting qbits. The body centered cubic unit cell sizes increase with increasing alloying. The results of magnetic susceptibility, electrical resistivity, and heat capacity characterization are reported. While elemental Ta is a type I superconductor, the alloys are type II strong coupling superconductors. Although decreasing the electron count per atom is expected to increase the density of electronic states at the Fermi level and thus the superconducting transition temperature (Tc) in these systems, we find that this is not sufficient to explain the significant increases in the superconducting Tc's observed.

Original languageEnglish (US)
Article number064802
JournalPhysical Review Materials
Issue number6
StatePublished - Jun 2023

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Physics and Astronomy (miscellaneous)


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