Pressure-induced superconductivity in ferromagnetic UIr without inversion symmetry

We report the discovery of pressure-induced superconductivity in ferromagnetic UIr, which lacks inversion symmetry in the crystal structure. The Curie temperature T_C1 = 46 K at ambient pressure decreases with increasing pressure, reaching a value of 11 K at 1.5 GPa. It presumably decreases further up to about P_c1 = 1.7 GPa. The ferromagnetic region named 'F1' exists up to P_c1. A second magnetic phase named 'F2' with a low ferromagnetic moment appears in the pressure range from 1.9 to 2.4 GPa. In the 'F2' phase, the magnetic transition temperature T_C2 decreases with pressure, from 18 K at 1.9 GPa to approximately zero at P _C2 = 2.6-2.7 GPa. In this critical pressure region, superconductivity appears below T_sc = 0.14 K.