Kavli Affiliate: David A. Muller
| First 5 Authors: Yidi Liu, Eun Kyo Ko, Yaoju Tarn, Lopa Bhatt, Berit H. Goodge
| Summary:
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.
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