Emergent Zeeman-Resilient Superconductivity Beyond the Spin-Paramagnetic Limit in Ultrathin NiBi3
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arXiv
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| Format: | Preprint |
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2025
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| author | Sant'Ana, Gabriel da Silva, Leonardo Pessoa Schio, Pedro Möckli, David Aarts, Jan Lahabi, Kaveh Tumelero, Milton A. |
| author_facet | Sant'Ana, Gabriel da Silva, Leonardo Pessoa Schio, Pedro Möckli, David Aarts, Jan Lahabi, Kaveh Tumelero, Milton A. |
| contents | 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$_3$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_14590 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Emergent Zeeman-Resilient Superconductivity Beyond the Spin-Paramagnetic Limit in Ultrathin NiBi3 Sant'Ana, Gabriel da Silva, Leonardo Pessoa Schio, Pedro Möckli, David Aarts, Jan Lahabi, Kaveh Tumelero, Milton A. Superconductivity 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$_3$. |
| title | Emergent Zeeman-Resilient Superconductivity Beyond the Spin-Paramagnetic Limit in Ultrathin NiBi3 |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2509.14590 |