Electric field control of superconducting fluctuations and quasiparticle interference at oxide 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_ | 1866913904357015552 |
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| author | Kimbell, Graham Filippozzi, Ulderico Gariglio, Stefano Gabay, Marc Glatz, Andreas Varlamov, Andrey Caviglia, Andrea |
| author_facet | Kimbell, Graham Filippozzi, Ulderico Gariglio, Stefano Gabay, Marc Glatz, Andreas Varlamov, Andrey Caviglia, Andrea |
| contents | We investigate tunable superconducting transitions in (111)$\mathrm{LaAlO}_3/\mathrm{KTaO}_3$ field-effect devices. Large increases in conductivity, associated with superconducting fluctuations, are observed far above the transition temperature. However, the standard Aslamazov-Larkin paraconductivity model significantly underestimates the effect observed here. We use a model that includes conductivity corrections from normal state quasiparticle interference together with all contributions from superconducting fluctuations evaluated at arbitrary temperatures and in the short-wavelength limit. Through analysis of the magnetoconductance and resistive transitions, we find that the large conductivity increase can be explained by a combination of weak anti-localization and Maki-Thompson superconducting fluctuations. Both contributions are enabled by a strong temperature dependence of the electron's decoherence time compatible with an electron-phonon scattering scenario. We find that conductivity corrections are modulated by the electrostatic field effect, that governs a competition between normal-state quasiparticle interference and superconducting fluctuations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_17056 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electric field control of superconducting fluctuations and quasiparticle interference at oxide interfaces Kimbell, Graham Filippozzi, Ulderico Gariglio, Stefano Gabay, Marc Glatz, Andreas Varlamov, Andrey Caviglia, Andrea Superconductivity We investigate tunable superconducting transitions in (111)$\mathrm{LaAlO}_3/\mathrm{KTaO}_3$ field-effect devices. Large increases in conductivity, associated with superconducting fluctuations, are observed far above the transition temperature. However, the standard Aslamazov-Larkin paraconductivity model significantly underestimates the effect observed here. We use a model that includes conductivity corrections from normal state quasiparticle interference together with all contributions from superconducting fluctuations evaluated at arbitrary temperatures and in the short-wavelength limit. Through analysis of the magnetoconductance and resistive transitions, we find that the large conductivity increase can be explained by a combination of weak anti-localization and Maki-Thompson superconducting fluctuations. Both contributions are enabled by a strong temperature dependence of the electron's decoherence time compatible with an electron-phonon scattering scenario. We find that conductivity corrections are modulated by the electrostatic field effect, that governs a competition between normal-state quasiparticle interference and superconducting fluctuations. |
| title | Electric field control of superconducting fluctuations and quasiparticle interference at oxide interfaces |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2506.17056 |