Here, we report the TiVNbTa medium-entropy alloy (MEA)
superconductor
with the mixed 3d–5d elements synthesized by an arc-melting
method. The TiVNbTa material has a body-centered cubic structure with
the cell parameter a = 3.2547(3) Å. The superconducting
properties of TiVNbTa were studied by resistivity, magnetic susceptibility,
and specific heat measurements. The experimental results show that
the bulk superconducting phase transition temperature of TiVNbTa is
about 4.65 K, and the upper and lower critical fields are 49.3(4)
mT and 5.9(5) T, respectively, which indicates that TiVNbTa is a type-II
superconductor. First-principles calculations show that the d electrons
of Ti, V, Nb, and Ta atoms play a significant role near the Fermi
level. The results show that TiVNbTa is a traditional s-wave superconductor
(ΔC
el/γT
c = 1.60(2), λep = 0.76(3)).
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