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Superconductivity in infinite-layer nickelate La1-xCaxNiO2 thin films.

ABSTRACT: We report the observation of superconductivity in infinite-layer Ca-doped LaNiO2 (La1-xCaxNiO2) thin films and construct their phase diagram. Unlike the metal-insulator transition in Nd- and Pr-based nickelates, the undoped and underdoped La1-xCaxNiO2 thin films are entirely insulating from 300 K down to 2 K. A superconducting dome is observed at 0.15 < x < 0.3 with weakly insulating behavior at the overdoped regime. Moreover, the sign of the Hall coefficient RH changes at low temperature for samples with a higher doping level. However, distinct from the Nd- and Pr-based nickelates, the RH-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.

SUBMITTER: Zeng S 

PROVIDER: S-EPMC8856608 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature

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Superconductivity in infinite-layer nickelate La<sub>1-x</sub>Ca<sub>x</sub>NiO<sub>2</sub> thin films.

Zeng Shengwei S   Li Changjian C   Chow Lin Er LE   Cao Yu Y   Zhang Zhaoting Z   Tang Chi Sin CS   Yin Xinmao X   Lim Zhi Shiuh ZS   Hu Junxiong J   Yang Ping P   Ariando Ariando A  

Science advances 20220218 7

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 b  ...[more]

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