Extended Data Fig. 1: Resistance near the structural phase transition.
From: High-temperature superconductivity with zero resistance and strange-metal behaviour in La3Ni2O7−δ
Resistance of La3Ni2O7−δ sample S1-1 at 13.7 GPa as a function of temperature from 280 K down to 2 K. The black (red) arrow denotes the data taken upon cooling (warming). At high temperatures there is both a weak anomaly and hysteresis between warming and cooling, which might be associated with a structural phase transition. Note that in Ref. 7 a change of room temperature crystal structure is observed above 10 GPa, and therefore this anomaly may correspond to a transition between the corresponding structural phases. The inset shows the sample configuration in the DAC after pressure loading. The resistance was measured using a four-probe method. The yellow and red arrows point to the gold electrode and the pressure-transmitting medium Daphne oil 7373, respectively. The black region in the middle is the sample, and the rubies and silver epoxy paste are underneath the sample.
