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This work was cofinanced by the National Science Center (Poland) under the OPUS 20 Project No.
2020/39/B/ST5/01782 and by University of Wrocław under the Excellence Initiative Research University Project No. BPIDUB.19.2021. P.S., R.T., and T.O. took part in the investigation; P.S., R.T., T.O., T.P., and R.I. took part in the formal analysis; P.S. and R.I. wrote the original draft; P.S., A.P., and R.I. reviewed
and edited the final version of manuscript; R.I. acquired the funding. The authors declare that they have no known competing financial interests or personal relationships that could have
appeared to influence the work reported in this pape.
Structural and physical properties of the high-entropy alloy (NbTa) 0.67 (MoHfW)0.33 were studied by x-ray
powder diffraction, energy dispersive x-ray spectroscopy, magnetization, electrical resistivity, and specific heat
measurements. The experimental results were supported by theoretical calculations using two complementary
approaches for electronic structure calculations: the Korringa-Kohn-Rostoker method with the coherent potential
approximation (KKR-CPA) and projector augmented wave (PAW) within the density functional theory. It was
found that the alloy forms with a cubic, body-centered structure (space group Im3m, W-type structure) with a lat-
tice parameter a = 3.287(1) Å and a random (but microscopically homogeneous) distribution of the constituent
elements. At high temperature the alloy exhibits simple metallic behavior, while at low temperature it becomes a
type-II superconductor with the critical temperature Tc ≈ 4.3 K and the upper critical field μ0Hc2 ≈ 1.45 T. The
electron-phonon coupling constant calculated from the PAW data, λth−PAW
el−ph = 0.63, is in perfect agreement with
the experimental results.
