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We report the superconducting properties of new hexagonalNb$_{10+2x}$Mo$_{35-x}$Ru$_{35-x}$Rh$_{10}$Pd$_{10}$ high-entropy alloys (HEAs)(0 $\leq$ $x$ $\leq$ 5). With increasing $x$, the superconducting transitiontemperature $T_{\rm c}$ shows a maximum of 6.19 K at $x$ = 2.5, while thezero-temperature upper critical field $B_{\rm c2}$(0) increases monotonically,reaching 8.3 T at $x$ = 5. For all $x$ values, the specific heat jump deviatesfrom the Bardeen-Cooper-Schreiffer behavior. In addition, we show that $T_{\rmc}$ of these HEAs is not determined mainly by the density of states at theFermi level and would be enhanced by lowering the valence electronconcentration.

Superconductivity in hexagonal Nb-Mo-Ru-Rh-Pd high-entropy alloys