Stoichiometric control of electron mobility and 2D superconductivity at LaAlO$_3$-SrTiO$_3$ interfaces
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arXiv
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| Autores principales: | , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
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| _version_ | 1866913209477234688 |
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| author | Singh, Gyanendra Guzman, Roger Saïz, Guilhem Zhou, Wu Gazquez, Jaume Fraxedas, Jordi Masoudinia, Fereshteh Winkler, Dag Claeson, Tord Bergeal, Nicolas Herranz, Gervasi Kalaboukhov, Alexei |
| author_facet | Singh, Gyanendra Guzman, Roger Saïz, Guilhem Zhou, Wu Gazquez, Jaume Fraxedas, Jordi Masoudinia, Fereshteh Winkler, Dag Claeson, Tord Bergeal, Nicolas Herranz, Gervasi Kalaboukhov, Alexei |
| contents | SrTiO$_3$-based conducting interfaces, which exhibit coexistence of gate-tunable 2D superconductivity and strong Rashba spin-orbit coupling (RSOC), are candidates to host topological superconductive phases. Yet, superconductivity is usually in the dirty limit, which tends to suppress nonconventional pairing and therefore challenges these expectations. Here we report on LaAlO$_3$/SrTiO$_3$ (LAO/STO) interfaces with remarkably large mobility and mean free paths comparable to the superconducting coherence length, approaching the clean limit for superconductivity. We further show that the carrier density, mobility, and formation of the superconducting condensate are controlled by the fine-tuning of La/Al chemical ratio in the LAO film. Interestingly, we find a region in the superconducting phase diagram where the critical temperature is not suppressed below the Lifshitz transition, at odds with previous experimental investigations. These findings point out the relevance of achieving a clean-limit regime to enhance the observation of unconventional pairing mechanisms in these systems |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_14365 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Stoichiometric control of electron mobility and 2D superconductivity at LaAlO$_3$-SrTiO$_3$ interfaces Singh, Gyanendra Guzman, Roger Saïz, Guilhem Zhou, Wu Gazquez, Jaume Fraxedas, Jordi Masoudinia, Fereshteh Winkler, Dag Claeson, Tord Bergeal, Nicolas Herranz, Gervasi Kalaboukhov, Alexei Superconductivity SrTiO$_3$-based conducting interfaces, which exhibit coexistence of gate-tunable 2D superconductivity and strong Rashba spin-orbit coupling (RSOC), are candidates to host topological superconductive phases. Yet, superconductivity is usually in the dirty limit, which tends to suppress nonconventional pairing and therefore challenges these expectations. Here we report on LaAlO$_3$/SrTiO$_3$ (LAO/STO) interfaces with remarkably large mobility and mean free paths comparable to the superconducting coherence length, approaching the clean limit for superconductivity. We further show that the carrier density, mobility, and formation of the superconducting condensate are controlled by the fine-tuning of La/Al chemical ratio in the LAO film. Interestingly, we find a region in the superconducting phase diagram where the critical temperature is not suppressed below the Lifshitz transition, at odds with previous experimental investigations. These findings point out the relevance of achieving a clean-limit regime to enhance the observation of unconventional pairing mechanisms in these systems |
| title | Stoichiometric control of electron mobility and 2D superconductivity at LaAlO$_3$-SrTiO$_3$ interfaces |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2401.14365 |