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<p>The discovery of high-temperature superconductivity under high pressure in Ruddlesden–Popper phase nickelates has captured notable attention in the condensed matter physics community. Here we report superconductivity in a distinct hybrid nickelate, La<sub>5</sub>Ni<sub>3</sub>O<sub>11</sub>, formed by alternating stacks of La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> and La<sub>2</sub>NiO<sub>4</sub> layers. This nickelate also exhibits a density-wave transition at approximately 170 K near ambient pressure. With increasing pressure, this density-wave transition shifts to higher temperatures and abruptly disappears around 12 GPa, followed by the emergence of superconductivity, indicating a first-order phase transition. But the optimal superconductivity with large superconducting volume fraction is observed at approximately 21 GPa with <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41567_2025_3023_Article_IEq1.gif" Format="GIF" Height="18" Rendition="HTML" Resolution="72" Type="Linedraw" Width="38" /> </InlineMediaObject> <EquationSource Format="TEX">\({T}_{{\rm{c}}}^{{\;\rm{zero}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mi>T</mi> </mrow> <mrow> <mi mathvariant="normal">c</mi> </mrow> <mrow> <mspace width="0.16em" /> <mi mathvariant="normal">zero</mi> </mrow> </msubsup> </math></EquationSource> </InlineEquation> = 54 K. High-pressure X-ray diffraction experiments reveal a structural phase transition from an orthorhombic structure to a tetragonal structure at lower pressure. Notably, this structural change has minimal impact on the density-wave or superconducting phases, suggesting a limited role of lattice degrees of freedom in this material. These findings establish La<sub>5</sub>Ni<sub>3</sub>O<sub>11</sub> as a new superconducting member of the Ruddlesden–Popper nickelate family and offer valuable insights into the interplay between structure, electronic order and superconductivity in hybrid nickelates.</p>

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Pressure induced superconductivity in hybrid Ruddlesden‒Popper La5Ni3O11 single crystals

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Mengzhu Shi,
  • Di Peng,
  • Kaibao Fan,
  • Zhenfang Xing,
  • Shaohua Yang,
  • Yuzhu Wang,
  • Houpu Li,
  • Rongqi Wu,
  • Mei Du,
  • Binghui Ge,
  • Zhidan Zeng,
  • Qiaoshi Zeng,
  • Jianjun Ying,
  • Tao Wu,
  • Xianhui Chen

摘要

The discovery of high-temperature superconductivity under high pressure in Ruddlesden–Popper phase nickelates has captured notable attention in the condensed matter physics community. Here we report superconductivity in a distinct hybrid nickelate, La5Ni3O11, formed by alternating stacks of La3Ni2O7 and La2NiO4 layers. This nickelate also exhibits a density-wave transition at approximately 170 K near ambient pressure. With increasing pressure, this density-wave transition shifts to higher temperatures and abruptly disappears around 12 GPa, followed by the emergence of superconductivity, indicating a first-order phase transition. But the optimal superconductivity with large superconducting volume fraction is observed at approximately 21 GPa with \({T}_{{\rm{c}}}^{{\;\rm{zero}}}\) T c zero  = 54 K. High-pressure X-ray diffraction experiments reveal a structural phase transition from an orthorhombic structure to a tetragonal structure at lower pressure. Notably, this structural change has minimal impact on the density-wave or superconducting phases, suggesting a limited role of lattice degrees of freedom in this material. These findings establish La5Ni3O11 as a new superconducting member of the Ruddlesden–Popper nickelate family and offer valuable insights into the interplay between structure, electronic order and superconductivity in hybrid nickelates.