Fractional-flux oscillations of Josephson critical currents in multi-gap superconductors: a test for unconventional superconductivity
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915152267313152 |
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| author | Donaire, M. Cano, A. |
| author_facet | Donaire, M. Cano, A. |
| contents | Josephson-junction interferometry has played a pivotal role in uncovering unconventional superconductivity in the cuprates. Using a Ginzburg-Landau-like approach, we generalize previous results to the genuine multi-gap case. Thus, we show that fractional flux oscillations of the Josephson critical current can arise as a direct consequence of multi-gap superconductivity. These oscillations reveal key information about the underlying superconducting states, including the unconventional $s_\pm$-wave state. Thus, our findings suggest new phase-sensitive experiments to characterize the Cooper pairing of new emerging superconductors such as the nickelates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_09964 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fractional-flux oscillations of Josephson critical currents in multi-gap superconductors: a test for unconventional superconductivity Donaire, M. Cano, A. Superconductivity Materials Science Quantum Gases Strongly Correlated Electrons Josephson-junction interferometry has played a pivotal role in uncovering unconventional superconductivity in the cuprates. Using a Ginzburg-Landau-like approach, we generalize previous results to the genuine multi-gap case. Thus, we show that fractional flux oscillations of the Josephson critical current can arise as a direct consequence of multi-gap superconductivity. These oscillations reveal key information about the underlying superconducting states, including the unconventional $s_\pm$-wave state. Thus, our findings suggest new phase-sensitive experiments to characterize the Cooper pairing of new emerging superconductors such as the nickelates. |
| title | Fractional-flux oscillations of Josephson critical currents in multi-gap superconductors: a test for unconventional superconductivity |
| topic | Superconductivity Materials Science Quantum Gases Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2502.09964 |