Systematic evolution of superconducting pairing strength and Seebeck coefficients in correlated infinite-layer La1–xSrxNiO2

IF 12.5 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2025-10-03 DOI:10.1126/sciadv.adv6488

Motoki Osada, Shusaku Imajo, Yuji Seki, Kousuke Ishida, Tsutomu Nojima, Kohei Fujiwara, Koichi Kindo, Yusuke Nomura, Atsushi Tsukazaki

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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 investigation across the superconducting dome reveals that the evolution of (thermo)electric normal-state properties—specifically, the sign changes of the Hall and Seebeck coefficients—coincides with the evolution of superconducting anisotropy and pairing strength. This demonstrates a definitive link between electron correlations and strong-coupling superconductivity in (La,Sr)NiO₂, contributing to a unified framework for understanding unconventional superconductivity.

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相关无限层la1 - x Sr x nio2超导配对强度和塞贝克系数的系统演化

与铜酸盐相比，最近发现的超导无限层镍酸盐提供了一个独特的平台，可以探索多波段系统中通往高温超导性和相关丰富量子相的奇特配对机制。在这里，我们证明了无限层（La,Sr）NiO - 2表现出强耦合超导性，在最佳掺杂下对超过47特斯拉的面内磁场有弹性，这是传统Bardeen-Cooper-Schrieffer超导体泡利极限的两倍多。这种违反在欠掺杂状态下变得明显，这意味着配对胶的一个有趣的进化。意想不到的正塞贝克系数的观察表明，存在着非平凡的电子关联。此外，我们对超导圆顶的综合研究表明，（热电）正常状态特性的演变-特别是霍尔系数和塞贝克系数的符号变化-与超导各向异性和配对强度的演变一致。这证明了（La,Sr） nio2中电子相关性与强耦合超导性之间的明确联系，有助于理解非常规超导性的统一框架。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.