Vortex core spectroscopy links pseudogap and Lifshitz critical point in a cuprate superconductor
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914201973293056 |
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| author | Singar, Tejas Parasram Maggio-Aprile, Ivan Gu, Genda Renner, Christoph |
| author_facet | Singar, Tejas Parasram Maggio-Aprile, Ivan Gu, Genda Renner, Christoph |
| contents | Understanding how superconductivity competes with other electronic phases in cuprates requires direct access to the hidden non-superconducting low temperature phase, for which Abrikosov vortices provide a unique local probe. We map the doping- and field-dependent evolution of vortex-core states in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+δ}$ across a broad doping range spanning the Fermi-surface Lifshitz transition. High-resolution scanning tunneling spectroscopy reveals a striking transformation of the vortex-core spectrum from unconventional, pseudogap-like signatures at moderate doping to more BCS-like behavior beyond a critical doping $p^* \approx 0.21$. This crossover aligns with the pseudogap endpoint and the onset of Fermi-surface reconstruction, indicating a direct link between pseudogap physics and vortex electronic structure. Our findings highlight the vortex core as a sensitive local probe of the cuprate ground state. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_13588 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Vortex core spectroscopy links pseudogap and Lifshitz critical point in a cuprate superconductor Singar, Tejas Parasram Maggio-Aprile, Ivan Gu, Genda Renner, Christoph Superconductivity Understanding how superconductivity competes with other electronic phases in cuprates requires direct access to the hidden non-superconducting low temperature phase, for which Abrikosov vortices provide a unique local probe. We map the doping- and field-dependent evolution of vortex-core states in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+δ}$ across a broad doping range spanning the Fermi-surface Lifshitz transition. High-resolution scanning tunneling spectroscopy reveals a striking transformation of the vortex-core spectrum from unconventional, pseudogap-like signatures at moderate doping to more BCS-like behavior beyond a critical doping $p^* \approx 0.21$. This crossover aligns with the pseudogap endpoint and the onset of Fermi-surface reconstruction, indicating a direct link between pseudogap physics and vortex electronic structure. Our findings highlight the vortex core as a sensitive local probe of the cuprate ground state. |
| title | Vortex core spectroscopy links pseudogap and Lifshitz critical point in a cuprate superconductor |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2512.13588 |