Coexistence of high electron-mobility, unpaired spins, and superconductivity at high carrier density SrTiO$_3$-based interfaces
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910956350603264 |
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| author | Hvid-Olsen, Thor Christoffersen, Christina H. Carrad, Damon J. Gauquelin, Nicolas Olsteins, Dags Verbeeck, Johan Bergeal, Nicolas Jespersen, Thomas S. Trier, Felix |
| author_facet | Hvid-Olsen, Thor Christoffersen, Christina H. Carrad, Damon J. Gauquelin, Nicolas Olsteins, Dags Verbeeck, Johan Bergeal, Nicolas Jespersen, Thomas S. Trier, Felix |
| contents | The $t_{2g}$ band-structure of SrTiO$_3$-based two-dimensional electron gasses (2DEGs), have been found to play a role in features such as the superconducting dome, high-mobility transport, and the magnitude of spin-orbit coupling. This adds to the already very diverse range of phenomena, including magnetism and extreme magnetoresistance, exhibited by this particular material platform. Tuning and/or combining these intriguing attributes could yield significant progress within quantum and spintronics technologies. Doing so demands precise control of the parameters, which requires a better understanding of the factors that affect them. Here we present effects of the $t_{2g}$ band-order inversion, stemming from the growth of spinel-structured $γ$-Al$_2$O$_3$ onto perovskite SrTiO$_3$. Electronic transport measurements show that with LaAlO$_3$/SrTiO$_3$ as the reference, the carrier density and electron mobility are enhanced, and the sample displays a reshaping of the superconducting dome. Additionally, unpaired spins are evidenced by increasing Anomalous Hall Effect with decreasing temperature, entering the same temperature range as the superconducting transition, and a Kondo-like upturn in the sheet resistance. Finally, it is argued that the high-mobility $d_{xz/yz}$-band is more likely than the $d_{xy}$-band to host the supercurrent. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_03824 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Coexistence of high electron-mobility, unpaired spins, and superconductivity at high carrier density SrTiO$_3$-based interfaces Hvid-Olsen, Thor Christoffersen, Christina H. Carrad, Damon J. Gauquelin, Nicolas Olsteins, Dags Verbeeck, Johan Bergeal, Nicolas Jespersen, Thomas S. Trier, Felix Materials Science Strongly Correlated Electrons Superconductivity The $t_{2g}$ band-structure of SrTiO$_3$-based two-dimensional electron gasses (2DEGs), have been found to play a role in features such as the superconducting dome, high-mobility transport, and the magnitude of spin-orbit coupling. This adds to the already very diverse range of phenomena, including magnetism and extreme magnetoresistance, exhibited by this particular material platform. Tuning and/or combining these intriguing attributes could yield significant progress within quantum and spintronics technologies. Doing so demands precise control of the parameters, which requires a better understanding of the factors that affect them. Here we present effects of the $t_{2g}$ band-order inversion, stemming from the growth of spinel-structured $γ$-Al$_2$O$_3$ onto perovskite SrTiO$_3$. Electronic transport measurements show that with LaAlO$_3$/SrTiO$_3$ as the reference, the carrier density and electron mobility are enhanced, and the sample displays a reshaping of the superconducting dome. Additionally, unpaired spins are evidenced by increasing Anomalous Hall Effect with decreasing temperature, entering the same temperature range as the superconducting transition, and a Kondo-like upturn in the sheet resistance. Finally, it is argued that the high-mobility $d_{xz/yz}$-band is more likely than the $d_{xy}$-band to host the supercurrent. |
| title | Coexistence of high electron-mobility, unpaired spins, and superconductivity at high carrier density SrTiO$_3$-based interfaces |
| topic | Materials Science Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2411.03824 |