Emergence of High-Temperature Superconducting Phase in Pressurized La 3 Ni 2 O 7 Crystals

The recent report of pressure-induced structural transition and signature of superconductivity with T c ≈ 80 K above 14 GPa in La 3 Ni 2 O 7 crystals has garnered considerable attention. To further elaborate this discovery, we carried out comprehensive resistance measurements on La 3 Ni 2 O 7 crystals grown in an optical-image floating zone furnace under oxygen pressure (15 bar) using a diamond anvil cell (DAC) and cubic anvil cell (CAC), which employ a solid (KBr) and liquid (glycerol) pressure-transmitting medium, respectively. Sample 1 measured in the DAC exhibits a semiconducting-like behavior with large resistance at low pressures and gradually becomes metallic upon compression. At pressures P ⩾ 13.7 GPa…