Extended Data Fig. 2: R(T) curves at 16.6 GPa under different currents and I-V curves at different pressures and temperatures.
From: High-temperature superconductivity with zero resistance and strange-metal behaviour in La3Ni2O7−δ
a, Resistance of sample S1-2 at 16.6 GPa in the vicinity of the superconducting transition, measured with different excitation currents. For currents below 31.6 μA, the resistance curve remains unaffected by the current magnitude. b, I-V curves of sample S1-2 at 1.5 K under various pressures. c, I-V curves of sample S1-2 at various temperatures under a pressure of 16.6 GPa. The critical current at 1.5 K is around 3 mA, and the sample has a cross-sectional area of 70 μm × 5 μm, allowing us to estimate a critical current density of 850 A/cm2.
