Extended Data Fig. 5: Transport characterization of the single crystal.
From: Visualization of oxygen vacancies and self-doped ligand holes in La3Ni2O7−δ
a, Resistance of the La3Ni2O7-δ single crystal versus temperature under ambient pressure. b, Resistance of the single crystal La3Ni2O7-δ versus temperature under high pressure at 22.4 GPa, exhibiting a superconducting transition.