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<p>The discovery of superconductivity in infinite-layer nickelates (IL, ABO<sub>2</sub>) has opened new avenues for understanding high-temperature superconductivity. However, progress in this field is hindered by significant synthesis challenges and the scarcity of research groups capable of producing superconducting samples. Here, we demonstrate a simple route for the topotactic reduction of nickelates using an aluminum overlayer deposited by sputtering on the precursor material (ABO<sub>3</sub>), enabling the fabrication of high-quality superconducting Pr<sub>0.8</sub>Sr<sub>0.2</sub>NiO<sub>2</sub> thin films. By systematically optimizing the aluminum deposition parameters, we achieved superconducting samples via in situ or ex situ (after air exposure of the precursor ABO<sub>3</sub> films) reduction. A comparative study of their structural and transport properties shows that in situ Al reduction improves film quality, yielding a maximum superconducting onset transition temperature of 17 K, consistent with the optimal value for this compound. This sputtering-based synthesis route, significantly more accessible than existing methods, offers enhanced control and reproducibility over the reduction process, lowering barriers to the exploration of nickelate superconductors.</p>

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Accessible synthesis of superconducting nickelates via topotactic reduction induced by aluminum sputter deposition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月25日

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  • Dongxin Zhang,
  • Aravind Raji,
  • Luis M. Vicente-Arche,
  • Alexandre Gloter,
  • Manuel Bibes,
  • Lucía Iglesias

摘要

The discovery of superconductivity in infinite-layer nickelates (IL, ABO2) has opened new avenues for understanding high-temperature superconductivity. However, progress in this field is hindered by significant synthesis challenges and the scarcity of research groups capable of producing superconducting samples. Here, we demonstrate a simple route for the topotactic reduction of nickelates using an aluminum overlayer deposited by sputtering on the precursor material (ABO3), enabling the fabrication of high-quality superconducting Pr0.8Sr0.2NiO2 thin films. By systematically optimizing the aluminum deposition parameters, we achieved superconducting samples via in situ or ex situ (after air exposure of the precursor ABO3 films) reduction. A comparative study of their structural and transport properties shows that in situ Al reduction improves film quality, yielding a maximum superconducting onset transition temperature of 17 K, consistent with the optimal value for this compound. This sputtering-based synthesis route, significantly more accessible than existing methods, offers enhanced control and reproducibility over the reduction process, lowering barriers to the exploration of nickelate superconductors.