Fig. 2. Transport properties and superconductivity of the infinite-layer Pr_0.82Sr_0.18NiO₂ thin films under high-pressure.

Temperature dependence of resistivity ρ(T) of Pr_0.82Sr_0.18NiO₂ thin films under various pressures a up to 6.6 GPa for sample No. 1 with Daphne 7373 and b up to 12.1 GPa for sample No. 2 with glycerol as PTM. The resistivity ρ(T) curves below 100 K c for No. 1 and d for No. 2, illustrating the variation of the superconducting transition temperatures with pressure. Except for data at 0 GPa, all other curves in c and d have been vertically shifted for clarity. The T_c^onset (up-pointing arrow) was determined as the temperature where resistivity starts to deviate from the extrapolated normal-state behavior and the T_c^offset (crossing point) was defined as the interception between two straight lines below and above the superconducting transition.