Superconductivity in infinite-layer nickelate La<sub>1-x</sub>Ca<sub>x</sub>NiO<sub>2</sub> thin films.
basic_science · Level V
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- Record sourced from PubMed, PMID 35179968.
- Also identified by DOI 10.1126/sciadv.abl9927 and PMC identifier 8856608.
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Abstract
We report the observation of superconductivity in infinite-layer Ca-doped LaNiO<sub>2</sub> (La<sub>1-<i>x</i></sub>Ca<i><sub>x</sub></i>NiO<sub>2</sub>) thin films and construct their phase diagram. Unlike the metal-insulator transition in Nd- and Pr-based nickelates, the undoped and underdoped La<sub>1-<i>x</i></sub>Ca<i><sub>x</sub></i>NiO<sub>2</sub> thin films are entirely insulating from 300 K down to 2 K. A superconducting dome is observed at 0.15 < <i>x</i> < 0.3 with weakly insulating behavior at the overdoped regime. Moreover, the sign of the Hall coefficient <i>R</i><sub>H</sub> changes at low temperature for samples with a higher doping level. However, distinct from the Nd- and Pr-based nickelates, the <i>R</i><sub>H</sub>-sign-change temperature remains at around 35 K as the doping increases, which begs further theoretical and experimental investigation to reveal the role of the 4f orbital to the (multi)band nature of the superconducting nickelates. Our results also emphasize a notable role of lattice correlation on the multiband structures of the infinite-layer nickelates.