Exploring Robust Superconductivity in High-Entropy Alloys under Extreme Pressure Conditions

High-entropy alloys (HEAs) have demonstrated a fascinating phenomenon - robust superconductivity - where the superconducting T_c is insensitive to applied pressure in the megabar regime. In this study, we employ the EPW code, based on density functional perturbation theory and maximally localized Wannier functions, for ab initio calculations of electron-phonon interactions. Our investigation includes systematic EPW and special quasi-random structures (SQS) calculations for cubic Nb, NbTi crystal, NbTi alloy, and (TaNb)_0.7(HfZrTi)_0.3 HEA, evaluating their superconducting T_c in the 0-150 GPa pressure range. These first-principles calculations show good quantitative agreement with experimental high-pressure T_c measurements. Our study not only elucidates how configurational or alloying disorder alters the electron-phonon properties, but also offers implications for tailoring superconducting performance in HEA systems under pressure.