Superconductivity in PrNiO2 infinite-layer nickelates

Abstract

Several reports about infinite-layer nickelate thin films suggest that the superconducting critical temperature versus chemical doping phase diagram has a dome-like shape, similar to cuprates. Here, we demonstrate a highly reproducible superconducting state in undoped PrNiO${}_2$ thin films grown onto SrTiO${}_3$. Scanning transmission electron microscopy measurements demonstrate coherent and defect-free infinite-layer phase, a high structural quality with no unintentional chemical doping and a total absence of interstitial oxygen. X-ray absorption measurements show very sharp features at the Ni L${}_{3,2}$-edges with a large linear dichroism, indicating the preferential hole-occupation of Ni${}^{1+}$-3d${}_{x^2-y^2}$ orbitals in a square planar geometry. Resonant inelastic X-ray scattering measurements reveal sharp magnon excitations of 200\,meV energy at magnetic Brillouin zone boundary, highly resonant at the Ni${}^{1+}$ absorption peak. The results indicate that, when properly stabilized, infinite-layer nickelate thin films are superconducting without chemical doping.

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Cited by in corpus (13)

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• Recent progress in nickelate superconductors
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• Signature of superconductivity in pressurized La4Ni3O10-x single crystals grown at ambient pressure
• Damage of bilayer structure in La3Ni2O7-d induced by high pO2 annealing
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• Spin-glass state in nickelate superconductors
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