Superconductivity and Electronic Structures of Nickelate Thin Film Superstructures

Abstract

Ruddlesden-Popper (RP) nickelates have emerged as a crucial platform for exploring the mechanisms of high-temperature superconductivity. However, the Fermi surface topology required for superconductivity remains elusive. Here, beyond the superconducting pure bilayer (2222) phase, we report the thin film growth and ambient-pressure superconductivity of monolayer-bilayer (1212) and bilayer-trilayer (2323) superstructures, together with the absence of superconductivity in monolayer-trilayer (1313) superstructure, under identical compressive epitaxial strain. The onset superconducting transition temperatures range from 46 to 50 K, exceeding the McMillan limit. Angle-resolved photoemission spectroscopy reveals key Fermi surface differences in these atomically-engineered structures. In superconducting 1212 and 2222 films, a dispersive hole-like band (${\gamma }^{\mathrm{II}}$) forms an underlying Fermi pocket, surrounding the Brillouin zone corner. In contrast, the top of the flat band (${\gamma }^{\mathrm{III}}$) is observed ~70 meV below $E_{\text{F}}$ in the non-superconducting 1313 films. Particularly, the superconducting 2323 films host both ${\gamma }^{\mathrm{II}}$ and ${\gamma }^{\mathrm{III}}$ bands. The polarization dependence of the $\gamma$ bands reveals their Ni $d_{z^2}$ origin. Our findings expand the family of ambient-pressure nickelate superconductors and establish a connection between structural configuration, electronic structure, and the emergence of superconductivity in nickelates.

References in corpus (36)

• Superconductivity near 80 Kelvin in single crystals of La3Ni2O7 under pressure
• High-temperature superconductivity with zero-resistance and strange metal behavior in La${}_3$Ni${}_2$O${}_{7-\delta }$
• Bilayer two-orbital model of La${}_3$Ni${}_2$O${}_7$ under pressure
• Superconductivity in pressurized trilayer La${}_4$Ni${}_3$O${}_{10-\delta }$ single crystals
• Electronic correlations and superconducting instability in La${}_3$Ni${}_2$O${}_7$ under high pressure
• Interlayer Coupling Driven High-Temperature Superconductivity in La${}_3$Ni${}_2$O${}_7$ Under Pressure
• Orbital-Dependent Electron Correlation in Double-Layer Nickelate La3Ni2O7
• Effective bi-layer model Hamiltonian and density-matrix renormalization group study for the high-Tc superconductivity in La${}_3$Ni${}_2$O${}_7$ under high pressure
• Ambient-pressure superconductivity onset above 40 K in bilayer nickelate ultrathin films
• Signature of superconductivity in pressurized La${}_4$Ni${}_3$O${}_{10}$
• High Temperature Superconductivity in La${}_3$Ni${}_2$O${}_7$
• Polymorphism in Ruddlesden-Popper $L{a}_{3}N{i}_2{O}_7$: Discovery of a Hidden Phase with Distinctive Layer Stacking
• Unconventional crystal structure of the high-pressure superconductor La${}_3$Ni${}_2$O${}_7$
• Superconductivity in nickelate and cuprate superconductors with strong bilayer coupling
• Effective model and pairing tendency in bilayer Ni-based superconductor La${}_3$Ni${}_2$O${}_7$
• Angle-resolved photoemission spectroscopy of superconducting (La,Pr)3Ni2O7/SrLaAlO4 heterostructures
• Superconductivity and normal-state transport in compressively strained La${}_2$PrNi${}_2$O${}_7$ thin films
• Cuprate-like Electronic Structures in Infinite-Layer Nickelates with Substantial Hole Dopings
• Electronic Correlation and Pseudogap-like Behavior of High-Temperature Superconductor La3Ni2O7
• Bulk superconductivity up to 96 K in pressurized nickelate single crystals
• Design and synthesis of three-dimensional hybrid Ruddlesden-Popper nickelate single crystals
• Correlated electronic structures and unconventional superconductivity in bilayer nickelate heterostructures
• Electronic Structure of Superconducting Infinite-Layer Lanthanum Nickelates
• Recent progress in nickelate superconductors
• Electronic structure of Ruddlesden-Popper nickelates: strain to mimic the effects pressure
• Universal waterfalls-like feature in the spectral function of high temperature superconductors
• Interstitial oxygen order and its competition with superconductivity in La${}_2$PrNi${}_2$O${}_{7+\delta }$
• Gigantic-oxidative atomic-layer-by-layer epitaxy for artificially designed complex oxides
• Electronic structures and multi-orbital models of La${}_3$Ni${}_2$O${}_7$ thin films at ambient pressure
• Phase diagrams and two key factors to superconductivity of Ruddlesden-Popper nickelates
• Superconducting Dome in ${\mathrm{La}}_{3-x}{\mathrm{Sr}}_x{\mathrm{Ni}}_2{\mathrm{O}}_{7-\delta }$ Thin Films
• Strain-Engineered Electronic Structure and Superconductivity in La${}_3$Ni${}_2$O${}_7$ Thin Films
• Electronic Structure, Magnetic and Pairing Tendencies of Alternating Single-layer Bilayer Stacking Nickelate La${}_5$Ni${}_3$O${}_{11}$ Under Pressure
• Preparation and optimization of high-temperature superconducting Ruddlesden-Popper nickelate thin films
• Local correlations necessitate waterfalls as a connection between quasiparticle band and developing Hubbard bands
• Pairing mechanism and superconductivity in pressurized La${}_5$Ni${}_3$O${}_{11}$

Cited by in corpus (4)

• Reducing the strain required for ambient-pressure superconductivity in bilayer nickelates
• Weakly anisotropic superconductivity of Pr4Ni3O10 single crystals
• Pairing mechanism and superconductivity in 1313 phase La${}_3$Ni${}_2$O${}_7$
• Progress of ambient-pressure superconductivity in bilayer nickelate thin films