Interlayer-Coupling-Driven High-Temperature Superconductivity in La 3 Ni 2 O 7 under Pressure

The newly discovered high-temperature superconductivity in ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ under pressure has attracted a great deal of attention. The essential ingredient characterizing the electronic properties is the bilayer ${\mathrm{NiO}}_{2}$ planes coupled by the interlayer bonding of $3{d}_{{z}^{2}}$ orbitals through the intermediate oxygen atoms. In the strong coupling limit, the low-energy physics is described by an intralayer antiferromagnetic spin-exchange interaction ${J}_{\ensuremath{\parallel}}$ between $3{d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ orbitals and an interlayer one ${J}_{\ensuremath{\perp}}$ between $3{d}_{{z}^{2}}$ orbitals. Taking into account Hund's rule on each…

• NN
  National Natural Science Foundation of China

  Awards: 12174317, 12074031, 12234016