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Emergent Zeeman-Resilient Superconductivity Beyond the Spin-Paramagnetic Limit in Ultrathin NiBi3

Year: 2025

Type: preprint

Abstract: The spin-paramagnetic limit sets a fundamental magnetic-field bound for conventional superconductors. Here we show that ultrathin NiBi$_3$ films develop a highly field-resilient superconducting state, with in-plane critical fields surpassing the spin-paramagnetic limit even above 0.9T$_C$. This enhancement is activated by dimensional confinement and depends sensitively on film thickness and morphology. Standard mechanisms, including strong spin-orbit coupling and multiband superconductivity, fail to quantitatively explain the observed robustness. These findings uncover an unconventional pathway for Zeeman-resistant superconductivity in low-dimensional materials beyond known Ising and Rashba scenarios, and further support earlier theoretical predictions of triplet pairing in low-dimensional NiBi$_3$.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2509.14590

Authors: Sant'Ana, Gabriel, da Silva, Leonardo Pessoa, Schio, Pedro, Möckli, David, Aarts, Jan, Lahabi, Kaveh, Tumelero, Milton A.

Institutions: Leiden University, Universidade Federal do Rio Grande do Sul, Brazilian Center for Research in Energy and Materials

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Universidade Federal do Rio Grande do Sul

OpenAlex ID: W4417081738

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