The polarisation fluctuation length scale shaping the superconducting dome of SrTiO$_3$
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910399845105664 |
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| author | Fauqué, Benoît Jiang, Shan Fennell, Tom Roessli, Bertrand Ivanov, Alexandre Roux-Byl, Celine Baptiste, Benoît Bourges, Philippe Behnia, Kamran Tomioka, Yasuhide |
| author_facet | Fauqué, Benoît Jiang, Shan Fennell, Tom Roessli, Bertrand Ivanov, Alexandre Roux-Byl, Celine Baptiste, Benoît Bourges, Philippe Behnia, Kamran Tomioka, Yasuhide |
| contents | Superconducting domes, ubiquitous across a variety of quantum materials, are often understood as a window favorite for pairing opened by the fluctuations of competing orders. Yet, a quantitative understanding of how such a window closes is missing. Here, we show that inelastic neutron scattering, by quantifying a length scale associated with polar fluctuations, $\ell_0$, addresses this issue. We find that the superconducting dome of strontium titanate definitely ends when $\ell_0$ vanishes. Moreover, the product of $\ell_0$ and the Fermi wavevector peaks close to the maximum critical temperature. Thus, this superconducting dome stems from the competition between the increase of the density of states and the unavoidable collapse of the quantum paraelectric phase, both induced by doping. The successful quantitative account of both the peak and the end of the superconducting dome implies a central role in the pairing mechanism played by the soft ferro-electric mode and its hybridisation with the acoustic branch. Such a scenario may also be at work in other quantum paraelectric materials, either bulk or interfaces. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_04154 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The polarisation fluctuation length scale shaping the superconducting dome of SrTiO$_3$ Fauqué, Benoît Jiang, Shan Fennell, Tom Roessli, Bertrand Ivanov, Alexandre Roux-Byl, Celine Baptiste, Benoît Bourges, Philippe Behnia, Kamran Tomioka, Yasuhide Superconductivity Strongly Correlated Electrons Superconducting domes, ubiquitous across a variety of quantum materials, are often understood as a window favorite for pairing opened by the fluctuations of competing orders. Yet, a quantitative understanding of how such a window closes is missing. Here, we show that inelastic neutron scattering, by quantifying a length scale associated with polar fluctuations, $\ell_0$, addresses this issue. We find that the superconducting dome of strontium titanate definitely ends when $\ell_0$ vanishes. Moreover, the product of $\ell_0$ and the Fermi wavevector peaks close to the maximum critical temperature. Thus, this superconducting dome stems from the competition between the increase of the density of states and the unavoidable collapse of the quantum paraelectric phase, both induced by doping. The successful quantitative account of both the peak and the end of the superconducting dome implies a central role in the pairing mechanism played by the soft ferro-electric mode and its hybridisation with the acoustic branch. Such a scenario may also be at work in other quantum paraelectric materials, either bulk or interfaces. |
| title | The polarisation fluctuation length scale shaping the superconducting dome of SrTiO$_3$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2404.04154 |