Table 2.

Summary of the electronic and phononic contributions to the superconductivity in the HEAs

Specific heat parameters	${\left[\text{TaNb}\right]}_{0.67}{\left(\text{ZrHfTi}\right)}_{0.33}$	${\left[\text{TaNb}\right]}_{0.16}{\left(\text{ZrHfTi}\right)}_{0.84}$	${\left[\text{TaNbV}\right]}_{0.67}{\left(\text{ZrHfTi}\right)}_{0.33}$
$T_{\text{c}},$ K	7.70	4.59	4.11
γ, mJ⋅mol−1⋅K−2	7.97(5)	6.45(8)	7.97(4)
β, mJ⋅mol−1⋅K−4	0.170(4)	0.311(9)	1.48(5)
${\mathrm{\Theta }}_{\text{D}},$ K	225(2)	184(2)	236(3)
${\lambda }_{\text{el}-\text{ph}}$	0.83	0.73	0.65
$D\left(E_{\text{F}}\right),$ st. eV−1/at. f.u.	1.9	1.6	2.1
$\mathrm{\Delta }C/\gamma T_{\text{c}}$	1.89	1.98	1.62
$\mathrm{\Delta }$(0), meV	1.21(2)	0.71(1)	0.56(1)
2$\mathrm{\Delta }$(0)/kBTc	3.7	3.6	3.2

The error of the fit of the specific heat is given in parentheses. st. eV⁻¹/at. f.u., states in eV⁻¹ per atomic formula unit.