Upper critical magnetic field and multiband superconductivity in artificial high-Tc superlattices of nano quantum wells
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Campi, G. Alimenti, A. Logvenov, G. Smith, G. A. Balakirev, F. F. Lee, S. -E. Balicas, L. Silva, E. Ummarino, G. A. Midei, G. Perali, A. Valletta, A. Bianconi, A. |
| author_facet | Campi, G. Alimenti, A. Logvenov, G. Smith, G. A. Balakirev, F. F. Lee, S. -E. Balicas, L. Silva, E. Ummarino, G. A. Midei, G. Perali, A. Valletta, A. Bianconi, A. |
| contents | Artificial high-Tc superlattices (AHTS) composed of quantum building blocks with tunable superconducting critical temperature have been synthesized by engineering their nanoscale geometry using the Bianconi-Perali-Valletta (BPV) two gaps superconductivity theory. These quantum heterostructures consist of quantum wells made of superconducting, modulation-doped Mott insulators (S), confined by a metallic (N) potential barrier. The lattice geometry has been carefully engineered to induce the predicted Fano-Feshbach shape resonance between the gaps, near a topological Lifshitz transition. Here, we validate the BPV theory by providing compelling experimental evidence that AHTS samples, at the peak of the superconducting dome, exhibit resonant two-band, two-gap superconductivity. This is demonstrated by measuring the temperature dependence of the upper critical magnetic field,Bc2, in samples with superlattice periods 3.3<d<5.28 nm and L/d ratios close to the magic value 2/3 (where L is the thickness of the superconducting La2CuO4 layer and d is the superlattice period). The data reveal the predicted upward concavity in Hc2(T) and a characteristic kink in the coherence length as a function of temperature, confirming the predicted two-band superconductivity with Fermi velocity ratio 0.25 and significant pair exchange term among the two condensates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_14335 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Upper critical magnetic field and multiband superconductivity in artificial high-Tc superlattices of nano quantum wells Campi, G. Alimenti, A. Logvenov, G. Smith, G. A. Balakirev, F. F. Lee, S. -E. Balicas, L. Silva, E. Ummarino, G. A. Midei, G. Perali, A. Valletta, A. Bianconi, A. Mesoscale and Nanoscale Physics Superconductivity Artificial high-Tc superlattices (AHTS) composed of quantum building blocks with tunable superconducting critical temperature have been synthesized by engineering their nanoscale geometry using the Bianconi-Perali-Valletta (BPV) two gaps superconductivity theory. These quantum heterostructures consist of quantum wells made of superconducting, modulation-doped Mott insulators (S), confined by a metallic (N) potential barrier. The lattice geometry has been carefully engineered to induce the predicted Fano-Feshbach shape resonance between the gaps, near a topological Lifshitz transition. Here, we validate the BPV theory by providing compelling experimental evidence that AHTS samples, at the peak of the superconducting dome, exhibit resonant two-band, two-gap superconductivity. This is demonstrated by measuring the temperature dependence of the upper critical magnetic field,Bc2, in samples with superlattice periods 3.3<d<5.28 nm and L/d ratios close to the magic value 2/3 (where L is the thickness of the superconducting La2CuO4 layer and d is the superlattice period). The data reveal the predicted upward concavity in Hc2(T) and a characteristic kink in the coherence length as a function of temperature, confirming the predicted two-band superconductivity with Fermi velocity ratio 0.25 and significant pair exchange term among the two condensates. |
| title | Upper critical magnetic field and multiband superconductivity in artificial high-Tc superlattices of nano quantum wells |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2503.14335 |