Unraveling Enhanced Superconductivity in Single-layer FeSe through Substrate Surface Terminations
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866913704718630912 |
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| author | Zou, Qiang Kim, Gi-Yeop Kang, Jong-Hoon Oli, Basu Dev Ge, Zhuozhi Weinert, Michael Mandal, Subhasish Eom, Chang-Beom Choi, Si-Young Li, Lian |
| author_facet | Zou, Qiang Kim, Gi-Yeop Kang, Jong-Hoon Oli, Basu Dev Ge, Zhuozhi Weinert, Michael Mandal, Subhasish Eom, Chang-Beom Choi, Si-Young Li, Lian |
| contents | Single-layer FeSe films grown on (001) SrTiO3 substrates have shown a significant increase in superconducting transition temperature compared to bulk FeSe. Several mechanisms have been proposed to explain such enhancement, including electron doping, interfacial electron-phonon coupling, and strong electron correlations. To pinpoint the primary driver, we grew FeSe films on SrTiO3 substrates with coexisting TiO2 and SrO surface terminations. Scanning tunneling spectroscopy revealed a larger superconducting gap of 17 meV for FeSe on TiO2 compared to 11 meV on SrO. Tunneling spectroscopy also showed a larger work function on SrO, leading to reduced charge transfer, as confirmed by angle-resolved photoemission spectroscopy. Scanning transmission electron microscopy revealed distinctive interfacial atomic-scale structures, with the Se-Fe-Se tetrahedral angle changing from 109.9° on SrO to 105.1° on TiO2. Compared to dynamical mean field theory calculations, these results suggest optimal electron correlations in FeSe/TiO2 for enhancing high-temperature superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_16784 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unraveling Enhanced Superconductivity in Single-layer FeSe through Substrate Surface Terminations Zou, Qiang Kim, Gi-Yeop Kang, Jong-Hoon Oli, Basu Dev Ge, Zhuozhi Weinert, Michael Mandal, Subhasish Eom, Chang-Beom Choi, Si-Young Li, Lian Superconductivity Single-layer FeSe films grown on (001) SrTiO3 substrates have shown a significant increase in superconducting transition temperature compared to bulk FeSe. Several mechanisms have been proposed to explain such enhancement, including electron doping, interfacial electron-phonon coupling, and strong electron correlations. To pinpoint the primary driver, we grew FeSe films on SrTiO3 substrates with coexisting TiO2 and SrO surface terminations. Scanning tunneling spectroscopy revealed a larger superconducting gap of 17 meV for FeSe on TiO2 compared to 11 meV on SrO. Tunneling spectroscopy also showed a larger work function on SrO, leading to reduced charge transfer, as confirmed by angle-resolved photoemission spectroscopy. Scanning transmission electron microscopy revealed distinctive interfacial atomic-scale structures, with the Se-Fe-Se tetrahedral angle changing from 109.9° on SrO to 105.1° on TiO2. Compared to dynamical mean field theory calculations, these results suggest optimal electron correlations in FeSe/TiO2 for enhancing high-temperature superconductivity. |
| title | Unraveling Enhanced Superconductivity in Single-layer FeSe through Substrate Surface Terminations |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2502.16784 |