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<p>Rare-earth infinite-layer nickelates are emerging unconventional superconductors, with materials synthesis largely limited to early lanthanide compounds. Here, we report phase-pure samarium-based nickelate thin films on (LaAlO<sub>3</sub>)<sub>0.3</sub>(Sr<sub>2</sub>TaAlO<sub>6</sub>)<sub>0.7</sub> (001) substrates, including the first demonstration of Sm<sub>1-x</sub>Sr<sub>x</sub>NiO<sub>2</sub>. Co-doped compounds achieve a record-small c-axis parameter (3.26 Å) and superconducting transitions up to 32.5 K, revealing a clear correlation between decreasing c-axis parameter and increasing critical temperature across different rare-earth systems. Angle-dependent magnetoresistance shows a hybrid 2D/3D superconductivity with enhanced rare-earth 5<i>d</i>–Ni 3 <i>d</i> orbital coupling, confirmed by resonant inelastic X-ray scattering. In addition, increasing Eu concentration drives a shift toward 3D superconductivity, and Eu-containing samples exhibit distinctive negative magnetoresistance even in the superconducting state. These findings advocate clear materials design principles for higher transition temperatures and exotic physics in infinite-layer nickelate superconductors through structural engineering of the rare-earth site.</p>

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Enhanced superconductivity and mixed-dimensional behaviour in infinite-layer samarium nickelate thin films

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月14日

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  • Mingwei Yang,
  • Heng Wang,
  • Jiayin Tang,
  • Junping Luo,
  • Xianfeng Wu,
  • Wenjing Xu,
  • Aile Wang,
  • Yuetong Wu,
  • Ruilin Mao,
  • Ze Wang,
  • Zhicheng Pei,
  • Guangdi Zhou,
  • Zhengang Dong,
  • Bohan Feng,
  • Lingchi Shi,
  • Wenjie Meng,
  • Chuanying Xi,
  • Li Pi,
  • Qingyou Lu,
  • Jun Okamoto,
  • Hsiao-Yu Huang,
  • Di-Jing Huang,
  • Haoliang Huang,
  • Qisi Wang,
  • Peng Gao,
  • Zhuoyu Chen,
  • Danfeng Li

摘要

Rare-earth infinite-layer nickelates are emerging unconventional superconductors, with materials synthesis largely limited to early lanthanide compounds. Here, we report phase-pure samarium-based nickelate thin films on (LaAlO3)0.3(Sr2TaAlO6)0.7 (001) substrates, including the first demonstration of Sm1-xSrxNiO2. Co-doped compounds achieve a record-small c-axis parameter (3.26 Å) and superconducting transitions up to 32.5 K, revealing a clear correlation between decreasing c-axis parameter and increasing critical temperature across different rare-earth systems. Angle-dependent magnetoresistance shows a hybrid 2D/3D superconductivity with enhanced rare-earth 5d–Ni 3 d orbital coupling, confirmed by resonant inelastic X-ray scattering. In addition, increasing Eu concentration drives a shift toward 3D superconductivity, and Eu-containing samples exhibit distinctive negative magnetoresistance even in the superconducting state. These findings advocate clear materials design principles for higher transition temperatures and exotic physics in infinite-layer nickelate superconductors through structural engineering of the rare-earth site.