Systematic evolution of superconducting pairing strength and Seebeck coefficients in correlated infinite-layer La<sub>1-<i>x</i></sub>Sr<i><sub>x</sub></i>NiO<sub>2</sub>.
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ABSTRACT: The recently found superconducting infinite-layer nickelates offer a unique platform to explore an exotic pairing mechanism in multiband systems toward high-temperature superconductivity and associated rich quantum phases, contrasting with cuprates. Here, we show that infinite-layer (La,Sr)NiO2 exhibits strong-coupling superconductivity, resilient to in-plane magnetic fields exceeding 47 tesla at optimal doping-more than twice the Pauli limit for conventional Bardeen-Cooper-Schrieffer superconductors. This violation becomes pronounced toward the underdoped regime, implying an intriguing evolution of pairing glue. The unexpected observation of positive Seebeck coefficients in this regime indicates the presence of nontrivial electron correlations. Furthermore, our comprehensive in
SUBMITTER: Osada M
PROVIDER: S-EPMC12494004 | biostudies-literature | 2025 Oct
REPOSITORIES: biostudies-literature
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