Superconductivity in CaBi2

M. J. Winiarski, B. Wiendlocha, S. Gołab, S. K. Kushwaha, P. Wiśniewski, D. Kaczorowski, J. D. Thompson, Robert Joseph Cava, T. Klimczuk

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Superconductivity is observed with critical temperature Tc = 2.0 K in self-flux-grown single crystals of CaBi2. This material adopts the ZrSi2 structure type with lattice parameters a = 4.696(1) Å, b = 17.081(2) Å and c = 4.611(1) Å. The crystals of CaBi2 were studied by means of magnetic susceptibility, specific heat and electrical resistivity measurements. The heat capacity jump at Tc is ΔC/γTc = 1.41, confirming bulk superconductivity; the Sommerfeld coefficient γ = 4.1 mJ mol-1 K-2 and the Debye temperature ΘD = 157 K. The electron-phonon coupling strength is λel-ph = 0.59, and the thermodynamic critical field Hc is low, between 111 and 124 Oe CaBi2 is a moderate coupling type-I superconductor. Results of electronic structure calculations are reported and charge densities, electronic bands, densities of states and Fermi surfaces are discussed, focusing on the effects of spin-orbit coupling and electronic property anisotropy. We find a mixed quasi-2D + 3D character in the electronic structure, which reflects the layered crystal structure of the material.

Original languageEnglish (US)
Pages (from-to)21737-21745
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number31
DOIs
StatePublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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