Identification of superconductivity in bilayer nickelate La3Ni2O7 under high pressure up to 100 GPa

ABSTRACT Identification of superconductivity in the Ruddlesden-Popper phases of nickelates under high pressure remains challenging. Here, we report a comprehensive study of the crystal structure, electrical resistance, and Meissner effect in single crystals of bilayer nickelate La3Ni2O7 under hydrostatic pressures up to 104 GPa. Using high-pressure X-ray diffraction, we observe a structural transition from an orthorhombic to a tetragonal phase above 40 GPa. Superconductivity emerges with a maximum onset transition temperature Tconset of 83 K at 18.0 GPa, accompanied by zero resistance. The superconducting phase is gradually suppressed and vanishes above 80 GPa, forming a right-triangle-like superconducting…

• SS
  Salt Science Research Foundation
• NN
  National Natural Science Foundation of China

  Awards: 2023YFA1406500, 12304187, 12425404, 12494591, 12474137, 12174454, BL15U1
• SY
  Sun Yat-sen University

  Award: 12304187
• SA
  Science and Technology Commission of Shanghai Municipality

  Awards: 22JC1410300, 22dz2260800
• NK
  National Key Research and Development Program of China

  Awards: 2023YFA1406500, 2023YFA1406000
• BA
  Basic and Applied Basic Research Foundation of Guangdong Province

  Awards: 2024A04J6417, 2024A04J4024, 2024B1515020040, 2022B1212010008, 2024A1515030030