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<p>The recent discovery of superconductivity in La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> and La<sub>4</sub>Ni<sub>3</sub>O<sub>10</sub> under pressure stimulates intensive research interests. These nickelates crystallize in an orthogonal/monoclinic structure and have a density-wave transition at ambient pressure. The application of pressure triggers a transition to tetragonal structure (<i>I4/mmm</i>), which is believed to be a key prerequisite for the emergence of superconductivity. Here, we report the first tetragonal nickelates La<sub>4</sub>Ni<sub>3</sub>O<sub>10</sub> microcrystals at ambient pressure. In tetragonal La<sub>4</sub>Ni<sub>3</sub>O<sub>10</sub>, transport measurements find that both density-wave and superconducting transitions are absent up to 160 GPa, indicating a robust tetragonal metallic ground state. Meanwhile, density functional theory calculations reveal a considerable contribution of <i>d</i><sub>z2</sub> orbital to the Fermi surface. The concurrent absence of density-wave state and high-pressure superconductivity in tetragonal La<sub>4</sub>Ni<sub>3</sub>O<sub>10</sub> suggests that the density-wave state instead of tetragonal structure is crucial for the superconductivity in nickelates under pressure. Our findings impose important constraints on the mechanism of pressure-induced superconductivity in nickelates.</p>

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Absence of superconductivity and density-wave transition in ambient-pressure tetragonal La4Ni3O10

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月25日

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  • Mengzhu Shi,
  • Yikang Li,
  • Yuxing Wang,
  • Di Peng,
  • Shaohua Yang,
  • Houpu Li,
  • Kaibao Fan,
  • Kun Jiang,
  • Junfeng He,
  • Qiaoshi Zeng,
  • Dongsheng Song,
  • Binghui Ge,
  • Ziji Xiang,
  • Zhenyu Wang,
  • Jianjun Ying,
  • Tao Wu,
  • Xianhui Chen

摘要

The recent discovery of superconductivity in La3Ni2O7 and La4Ni3O10 under pressure stimulates intensive research interests. These nickelates crystallize in an orthogonal/monoclinic structure and have a density-wave transition at ambient pressure. The application of pressure triggers a transition to tetragonal structure (I4/mmm), which is believed to be a key prerequisite for the emergence of superconductivity. Here, we report the first tetragonal nickelates La4Ni3O10 microcrystals at ambient pressure. In tetragonal La4Ni3O10, transport measurements find that both density-wave and superconducting transitions are absent up to 160 GPa, indicating a robust tetragonal metallic ground state. Meanwhile, density functional theory calculations reveal a considerable contribution of dz2 orbital to the Fermi surface. The concurrent absence of density-wave state and high-pressure superconductivity in tetragonal La4Ni3O10 suggests that the density-wave state instead of tetragonal structure is crucial for the superconductivity in nickelates under pressure. Our findings impose important constraints on the mechanism of pressure-induced superconductivity in nickelates.