Enhanced Superconductivity at Quantum-Critical KTaO3 Interfaces
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909906248925184 |
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| author | Kim, Jieun Yu, Muqing Omran, Ahmed Yang, Jiangfeng Ramachandran, Ranjani Nachlas, William O. Irvin, Patrick Levy, Jeremy Eom, Chang-Beom |
| author_facet | Kim, Jieun Yu, Muqing Omran, Ahmed Yang, Jiangfeng Ramachandran, Ranjani Nachlas, William O. Irvin, Patrick Levy, Jeremy Eom, Chang-Beom |
| contents | Superconductivity at oxide interfaces has intrigued researchers for decades, yet the underlying pairing mechanism remains elusive. Here we demonstrate that proximity to a ferroelectric quantum critical point dramatically enhances interfacial superconductivity in KTaO3. By precisely tuning KTaO3 to its quantum critical composition through 0.8% niobium doping, we achieve a near-doubling of the superconducting transition temperature, reaching 2.9 K. Remarkably, a dome-shaped carrier density dependence emerges exclusively at the quantum critical point, contrasting sharply with the linear scaling observed in undoped interfaces. Our findings establish ferroelectric quantum criticality as a powerful mechanism for enhancing superconductivity and provide compelling evidence for soft-phonon-mediated pairing in these systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_12904 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhanced Superconductivity at Quantum-Critical KTaO3 Interfaces Kim, Jieun Yu, Muqing Omran, Ahmed Yang, Jiangfeng Ramachandran, Ranjani Nachlas, William O. Irvin, Patrick Levy, Jeremy Eom, Chang-Beom Superconductivity Materials Science Strongly Correlated Electrons Superconductivity at oxide interfaces has intrigued researchers for decades, yet the underlying pairing mechanism remains elusive. Here we demonstrate that proximity to a ferroelectric quantum critical point dramatically enhances interfacial superconductivity in KTaO3. By precisely tuning KTaO3 to its quantum critical composition through 0.8% niobium doping, we achieve a near-doubling of the superconducting transition temperature, reaching 2.9 K. Remarkably, a dome-shaped carrier density dependence emerges exclusively at the quantum critical point, contrasting sharply with the linear scaling observed in undoped interfaces. Our findings establish ferroelectric quantum criticality as a powerful mechanism for enhancing superconductivity and provide compelling evidence for soft-phonon-mediated pairing in these systems. |
| title | Enhanced Superconductivity at Quantum-Critical KTaO3 Interfaces |
| topic | Superconductivity Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2511.12904 |