Superconductivity in CaBi 2

Winiarski, M. J.; Wiendlocha, B.; Golba, S.; Kushwaha, S. K.; Wisniewski, P.; Kaczorowski, D.; Thompson, J. D.; Cava, R. J.; Klimczuk, T.

doi:10.1039/C6CP02856J

Title: Superconductivity in CaBi ₂

Journal Article · Tue Jul 12 00:00:00 EDT 2016 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/C6CP02856J· OSTI ID:1364537

Winiarski, M. J. ^[1]; Wiendlocha, B. ^[2]; Golba, S. ^[2]; Kushwaha, S. K. ^[3]; Wisniewski, P. ^[4]; Kaczorowski, D. ^[4];

^[5]; Cava, R. J. ^[3]; Klimczuk, T. ^[1]

Gdansk Univ. of Technology (Poland)
AGH Univ. of Science and Technology, Krakow (Poland)
Princeton Univ., NJ (United States)
Polish Academy of Sciences, Wroclaw (Poland)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We observed superconductivity with critical temperature T_c = 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 T_c is ΔC/γT_c = 1.41, confirming bulk superconductivity; the Sommerfeld coefficient γ = 4.1 mJ mol^-1 K^-2 and the Debye temperature Θ_D = 157 K. The electron–phonon coupling strength is λ_el–ph = 0.59, and the thermodynamic critical field H_c is low, between 111 and 124 Oe CaBi₂ is a moderate coupling type-I superconductor. Our 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. Furthermore, we find a mixed quasi-2D + 3D character in the electronic structure, which reflects the layered crystal structure of the material.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC52-06NA25396; FG02-98ER45706

OSTI ID:: 1364537

Report Number(s):: LA-UR-16-22999; PPCPFQ

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Vol. 18, Issue 31; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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