Superconductivity and normal-state transport in compressively strained La${}_2$PrNi${}_2$O${}_7$ thin films

Abstract

The discovery of superconductivity under high pressure in Ruddlesden-Popper phases of bulk nickelates has sparked great interest in stabilizing ambient pressure superconductivity in thin-film form using epitaxial strain. Recently, signs of superconductivity have been observed in compressively strained bilayer nickelate thin films with an onset temperature exceeding 40 K, albeit with broad and two-step-like transitions. Here, we report intrinsic superconductivity and normal-state transport properties in compressively strained La${}_2$PrNi${}_2$O${}_7$ thin films, achieved through a combination of isovalent Pr substitution, growth optimization, and precision ozone annealing. The superconducting onset occurs above 48 K, with zero resistance reached above 30 K, and the critical current density at 1.4 K is 100-fold larger than previous reports. The normal-state resistivity exhibits quadratic temperature dependence indicative of Fermi liquid behaviour, and other phenomenological similarities to transport in overdoped cuprates suggest parallels in their emergent properties.

18 pages, 4 figures. The updated manuscript includes an Author Correction for the sign error in the Hall coefficient

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Cited by in corpus (18)

• Bulk superconductivity up to 96 K in pressurized nickelate single crystals
• Superconductivity and Electronic Structures of Nickelate Thin Film Superstructures
• Strong-coupling study of the pairing mechanism in pressurized La${}_3$Ni${}_2$O${}_7$
• 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
• Possible Liquid-Nitrogen-Temperature Superconductivity Driven by Perpendicular Electric Field in the Single-Bilayer Film of La${}_3$Ni${}_2$O${}_7$ at Ambient Pressure
• Enhanced superconductivity in the compressively strained bilayer nickelate thin films by pressure
• Stabilizing and Tuning Superconductivity in La${}_3$Ni${}_2$O${}_{7-\delta }$ Films: Oxygen Recycling Protocol Reveals Hole-Doping Analogue
• Nodeless superconducting gap and electron-boson coupling in (La,Pr,Sm)${}_3$Ni${}_2$O${}_7$ films
• Electronic reconstruction and interface engineering of emergent spin fluctuations in compressively strained La${}_3$Ni${}_2$O${}_7$ on SrLaAlO${}_4$(001)
• Superexchanges and Charge Transfer in the La${}_3$Ni${}_2$O${}_7$ Thin Films
• 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
• Non-Fermi liquid behavior in La${}_3$Ni${}_2$O${}_7$ thin films under hydrostatic pressure
• Progress of ambient-pressure superconductivity in bilayer nickelate thin films
• Expanding the trilayer Ruddlesden-Popper nickelate family: Synthesis and characterization of Sm${}_4$Ni${}_3$O${}_{10-\delta }$ single crystals
• Strain-triggered high-temperature superconducting transition in two-dimensional carbon allotrope
• 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