Strain-tuning for superconductivity in La${}_3$Ni${}_2$O${}_7$ thin films

Abstract

The recent discovery of high-transition temperature ($T_{\mathrm{c}}$) superconductivity in pressurized La${}_3$Ni${}_2$O${}_7$ bulk crystals has attracted keen attention due to its characteristic energy diagram of $e_g$ orbitals, containing nearly half-filled $d_{3z^2-r^2}$ and quarter-filled $d_{x^2-y^2}$ orbitals. This finding provides valuable insights into the orbital contributions and interlayer interactions in double NiO${}_6$ octahedra, offering opportunities to control the electronic structure via ligand field variations. Here, we demonstrate strain-tuning of $T_{\mathrm{c}}$ over a range of 50 K in La${}_3$Ni${}_2$O${}_7$ films grown on different oxide substrates under 20 GPa. As the $c/a$ ratio increases, the onset $T_{\mathrm{c}}$ systematically rises from 10 K in the tensile-strained film on SrTiO${}_3$ to a maximum of about 60 K in the compressively strained film on LaAlO${}_3$. These systematic variations suggest that strain engineering is a promising strategy for expanding superconductivity in bilayer nickelates by tuning the orbital energy landscape toward high-$T_{\mathrm{c}}$ superconductivity.

18 pages, 4 figures

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Cited by in corpus (15)

• Recent progress in nickelate superconductors
• Strain-Engineered Electronic Structure and Superconductivity in La${}_3$Ni${}_2$O${}_7$ Thin Films
• Superconductivity governed by Janus-faced fermiology in strained bilayer nickelates
• Enhanced superconductivity in the compressively strained bilayer nickelate thin films by pressure
• Fermi surface reconstruction and enhanced spin fluctuations in strained La${}_3$Ni${}_2$O${}_7$ on LaAlO${}_3$(001) and SrTiO${}_3$(001)
• Preparation and optimization of high-temperature superconducting Ruddlesden-Popper nickelate thin films
• General trends of electronic structures, superconducting pairing, and magnetic correlations in the Ruddlesden-Popper nickelate $m$-layered superconductors La${}_{m+1}$Ni${}_m$O${}_{3m+1}$
• Superexchanges and Charge Transfer in the La${}_3$Ni${}_2$O${}_7$ Thin Films
• Quantum phase transition driven by competing intralayer and interlayer hopping in bilayer nickelates
• Compressive Strain Turns $s^{\pm }$ into $d$-Wave Pairing in One-unit-cell La${}_3$Ni${}_2$O${}_7$ Thin Film Via Substrate-Induced Hole Doping
• Progress of ambient-pressure superconductivity in bilayer nickelate thin films
• Non-Fermi liquid behavior in La${}_3$Ni${}_2$O${}_7$ thin films under hydrostatic pressure
• Impact of multiband effects on non-Fermi-liquid transport phenomena in bilayer nickelates
• Bridging ambient- and high-pressure superconductivity in La${}_2$LnNi${}_2$O${}_7$ films
• Pauli-limited upper critical field and anisotropic depairing effect of La2.82Sr0.18Ni2O7 superconducting thin film