Theoretical study on the possibility of high $T_c$ s$\pm$-wave superconductivity in the heavily hole-doped infinite layer nickelates

Abstract

We theoretically propose a possibility of realizing high $T_c$ superconductivity having $s\pm$-wave symmetry in the heavily hole-doped infinite layer nickelates La${}_{1-x}$Sr${}_x$NiO${}_2$. We consider situations where the original $P4/mmm$ symmetry of LaNiO${}_2$ is maintained even for a significant amount of Sr substitution by growing thin films on substrates having tetragonal symmetry. Considering such cases is indeed justified by our phonon calculations. For electron configurations somewhat close to $d^8$, the interaction between the $d_{x^2-y^2}$ band and the other $3d$ bands that lie just below the Fermi level results in an enhancement of superconductivity where the sign of the gap function is reversed between the former and the latter bands. The strong enhancement of superconductivity can be attributed to the large energy level offset between $d_{x^2-y^2}$ and other orbitals due to the absence of the apical oxygens, as has been pointed out in previous studies.

7 pages, 4 figures

References in corpus (18)

• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Superconductivity near 80 Kelvin in single crystals of La3Ni2O7 under pressure
• Nickelate superconductivity without rare-earth magnetism: (La,Sr)NiO${}_2$
• High-temperature superconductivity with zero-resistance and strange metal behavior in La${}_3$Ni${}_2$O${}_{7-\delta }$
• Superconductivity in pressurized trilayer La${}_4$Ni${}_3$O${}_{10-\delta }$ single crystals
• Superconductivity in infinite-layer nickelate La${}_{1-x}$Ca${}_x$NiO${}_2$ thin films
• Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor
• Pressure-induced superconductivity in polycrystalline La3Ni2O7
• Signature of superconductivity in pressurized La${}_4$Ni${}_3$O${}_{10}$
• Ab initio Derivation of Low-energy Model for Iron-Based Superconductors LaFeAsO and LaFePO
• Theoretical analysis on the possibility of superconductivity in a trilayer Ruddlesden-Popper nickelate La${}_4$Ni${}_3$O${}_{10}$ under pressure and its experimental examination: comparison with La${}_3$Ni${}_2$O${}_7$
• Effects of Pressure and Doping on Ruddlesden-Popper phases Lan+1NinO3n+1
• Ferromagnetic fluctuation and possible triplet superconductivity in Na_xCoO_2*yH_2O: Fluctuation-exchange study of multi-orbital Hubbard model
• Superconductivity in trilayer nickelate La4Ni3O10 under pressure
• Optimizing superconductivity: from cuprates via nickelates to palladates
• On the origin of topotactic reduction effect for superconductivity in infinite-layer nickelates
• Topotactic-hydrogen forms chains in $AB$O${}_2$ nickelate superconductors
• Interface tool from Wannier90 to RESPACK: wan2respack

Cited by in corpus (1)

• Lattice dynamics of the infinite-layer nickelate LaNiO${}_2$