Theory of potential impurity scattering in pressurized superconducting La3Ni2O7
Abstract Recently discovered high-T c superconductivity in pressurized bilayer nickelate La3Ni2O7(La-327)is likely driven by the non-phononic repulsive interaction. Depending on the interlayer repulsion strength, the superconducting gap structure is expected to be either d-wave or sign-changing bond...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-04-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-025-02056-7 |
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| Summary: | Abstract Recently discovered high-T c superconductivity in pressurized bilayer nickelate La3Ni2O7(La-327)is likely driven by the non-phononic repulsive interaction. Depending on the interlayer repulsion strength, the superconducting gap structure is expected to be either d-wave or sign-changing bonding-antibonding s ±-wave. Unfortunately, conventional spectroscopic probes of the gap structure are impractical due to the high-pressure requirement. We propose studying the effect of point-like non-magnetic impurities to distinguish these symmetries, which can be achieved by electron irradiation before applying pressure. Here, we theoretically predict conventional suppression for d-wave superconductivity, whereas the suppression for the interlayer s ± -wave state depends subtly on the asymmetry of bonding and antibonding subspaces. For the predicted electronic structure of La-327, the s ± -wave is more robust, with T c showing a convex-to-concave transition, indicating a crossover to s ++-wave symmetry as impurity concentration increases. We further analyze the sensitivity of these findings to potential electronic structure modifications. |
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| ISSN: | 2399-3650 |