Structural phase transition, s±-wave pairing, and magnetic stripe order in bilayered superconductor La3Ni2O7 under pressure

Abstract Motivated by the recently discovered high- T c superconductor La 3 Ni 2 O 7 , we comprehensively study this system using density functional theory and random phase approximation calculations. At low pressures, the Amam phase is stable, containing the Y 2− mode distortion from the Fmmm phase, while the Fmmm phase is unstable. Because of small differences in enthalpy and a considerable Y 2− mode amplitude, the two phases may coexist in the range between 10.6 and 14 GPa, beyond which the Fmmm phase dominates. In addition, the magnetic stripe-type spin order with wavevector ( π , 0) was stable at the intermediate region. Pairing is induced in the s ± -wave channel due to partial nesting between the M = (…

• UD
  U.S. Department of Energy
• OO
  Office of Science
• BE
  Basic Energy Sciences