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<p>Recently discovered high-T<sub><i>c</i></sub> superconductivity in pressurized bilayer nickelate La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub>(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 <i>d</i>-wave or sign-changing bonding-antibonding <i>s</i><sub>±</sub>-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 <i>d</i>-wave superconductivity, whereas the suppression for the interlayer <i>s</i><sub>±</sub>&#xa0;-wave state depends subtly on the asymmetry of bonding and antibonding subspaces. For the predicted electronic structure of La-327, the <i>s</i><sub>±</sub>&#xa0;-wave is more robust, with <i>T</i><sub><i>c</i></sub> showing a convex-to-concave transition, indicating a crossover to <i>s</i><sub>++</sub>-wave symmetry as impurity concentration increases. We further analyze the sensitivity of these findings to potential electronic structure modifications.</p>

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Theory of potential impurity scattering in pressurized superconducting La3Ni2O7

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月12日

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  • Steffen Bötzel,
  • Frank Lechermann,
  • Takasada Shibauchi,
  • Ilya M. Eremin

摘要

Recently discovered high-Tc 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 Tc 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.