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<p>The discovery of superconducting infinite-layer nickelates has provided valuable insights into the mechanisms of unconventional superconductivity. While experimental reports on these materials have been limited to thin films, they have recently expanded to various lanthanide compounds and superlattices. Here we investigate the unique oxygen reduction effect via topotactic reaction at the interfaces in bicolor and tricolour superlattices composed of SrTiO<sub>3</sub>, LaAlO<sub>3</sub>, and La<sub>0.8</sub>Sr<sub>0.2</sub>NiO<sub>2</sub> by nonreciprocal transport measurement. In overall well-regulated superlattices, scanning transmission electron microscopy reveals the presence of residual oxygen in La<sub>0.8</sub>Sr<sub>0.2</sub>NiO<sub>2</sub> asymmetrically at top or bottom interfaces. Two origins by stacking sequence and asymmetric residual oxygen for inducing asymmetries play a key role in emerging the nonreciprocal charge transport at normal and superconducting states, respectively. Our observation of nonreciprocal transport demonstrates that the interfacial engineering in infinite-layer nickelates can serve as an effective route to address superconducting mechanisms.</p>

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Nonreciprocal charge transport in asymmetric oxygen-reduced La0.8Sr0.2NiO2 superlattices

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月10日

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  • Taisei Nishida,
  • Motoki Osada,
  • Shun Sasano,
  • Ryo Ishikawa,
  • Tsutomu Nojima,
  • Naoya Shibata,
  • Atsushi Tsukazaki

摘要

The discovery of superconducting infinite-layer nickelates has provided valuable insights into the mechanisms of unconventional superconductivity. While experimental reports on these materials have been limited to thin films, they have recently expanded to various lanthanide compounds and superlattices. Here we investigate the unique oxygen reduction effect via topotactic reaction at the interfaces in bicolor and tricolour superlattices composed of SrTiO3, LaAlO3, and La0.8Sr0.2NiO2 by nonreciprocal transport measurement. In overall well-regulated superlattices, scanning transmission electron microscopy reveals the presence of residual oxygen in La0.8Sr0.2NiO2 asymmetrically at top or bottom interfaces. Two origins by stacking sequence and asymmetric residual oxygen for inducing asymmetries play a key role in emerging the nonreciprocal charge transport at normal and superconducting states, respectively. Our observation of nonreciprocal transport demonstrates that the interfacial engineering in infinite-layer nickelates can serve as an effective route to address superconducting mechanisms.