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Local distortions of the crystal structure and their influence on theelectronic structure, electron-phonon interaction, and superconductivity aretheoretically studied in the superconducting high-entropy alloy (HEA)(TaNb)$_{0.67}$(HfZrTi)$_{0.33}$. Distortions of the crystal lattice are causedby the relaxation of atomic positions and are studied in the twelve models ofsupercells. The largest relative changes in the interatomic distances due torelaxation reach 8\%. On average, local distortions tend to lower the densityof states at the Fermi level and significantly reduce the electron-phononcoupling parameter $\lambda$. As a result, the calculated superconductingcritical temperature is reduced to about 50\% of the initial value, which showsthe strong impact of structural disorder on superconductivity in this prototypehigh-entropy alloy. With the reduced value of $\lambda$, the theoretical $T_c$is closer to the experiment for typical values of the Columomb pseudopotentialparameter $\mu^*$. The experimental $T_c$ can be reproduced by taking aslightly enhanced $\mu^* = 0.176$, which leaves little room for the possibilityof suppression of superconductivity by disorder.

physical review. b./physical review. b

Local distortions of the crystal structure and their influence on the  electronic structure and superconductivity of the high-entropy alloy  (TaNb)0.67(HfZrTi)0.33