s ± -Wave Pairing and the Destructive Role of Apical-Oxygen Deficiencies in La 3 Ni 2 O 7 under Pressure

Recently, the bilayer perovskite nickelate ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ has been reported to show evidence of high-temperature superconductivity (SC) under a moderate pressure of about 14 GPa. To investigate the superconducting mechanism, pairing symmetry, and the role of apical-oxygen deficiencies in this material, we perform a random-phase approximation based study on a bilayer model consisting of the ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ and ${d}_{3{z}^{2}\ensuremath{-}{r}^{2}}$ orbitals of Ni atoms in both the pristine crystal and the crystal with apical-oxygen deficiencies. Our analysis reveals an ${s}^{\ifmmode\pm\else\textpm\fi{}}$-wave pairing symmetry driven by spin…

• NN
  National Natural Science Foundation of China

  Awards: 11774143, 11674025, 12074031, 11861161001, 12234016
• ST
  Science, Technology and Innovation Commission of Shenzhen Municipality

  Award: ZDSYS20190902092905285
• SU
  Southern University of Science and Technology
• SF
  Shenzhen Fundamental Research Program

  Award: JCYJ20220818100405013
• NK
  National Key Research and Development Program of China

  Award: 2022YFA1403700
• BA
  Basic and Applied Basic Research Foundation of Guangdong Province

  Award: 2020B1515120100