Hydrostatic pressure effects on superconducting properties of the noncentrosymmetric high-entropy alloy (HfNb) 0.10 (MoRuRe)0.90

We investigate the effects of hydrostatic pressure on the superconducting properties of a noncentrosymmetric high-entropy alloy (HEA) (HfNb)0.10(MoRuRe)0.90. Temperature-dependent resistivity (ρ(T)) and magnetization measurements were performed under pressures to assess variations in the superconducting transition temperature (Tc), upper and lower critical fields, and critical current density (Jc). Increasing pressure up to 12 GPa resulted in minor changes in Tc (~0.3 K) and normal-state resistivity (~2 µΩ.m), highlighting the robustness of the superconducting state. The upper critical field, Hc2(0), remained close to the Pauli limiting field, Hp(0), up to 2.9 GPa, and the Maki parameter αM >1 indicates significant Pauli pair-breaking effects. Thermally activated flux flow (TAFF) analysis in ρ(T, H) confirmed the coexistence of single and collective vortex states. At the same time, the lower critical field, critical current density (Jc), and pinning properties exhibited minimal changes in grain boundaries and pinning behavior up to 1.2 GPa. These findings highlight the stable superconducting nature of this HEA under high pressure, offering insights into potential high-pressure applications.