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<p>The bilayer nickelate La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> under pressure has recently emerged as a promising system for high-<i>T</i><sub><i>c</i></sub> superconductivity. In this work, we investigate the fate of the superconducting properties in La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub> under pressure, focusing on the effects of structural deformation and apical oxygen vacancies. Employing a low-energy effective <i>t</i>-<i>J</i><sub>∥</sub>-<i>J</i><sub>⊥</sub> model for the <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42005_2025_2266_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="51" /> </InlineMediaObject> <EquationSource Format="TEX">\(3{d}_{{x}^{2}-{y}^{2}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mn>3</mn> <msub> <mrow> <mi>d</mi> </mrow> <mrow> <msup> <mrow> <mi>x</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> <mo>−</mo> <msup> <mrow> <mi>y</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> </mrow> </msub> </math></EquationSource> </InlineEquation> orbitals within the slave-boson mean-field approach, we demonstrate that the pairing strength is significantly enhanced in the high-pressure tetragonal <i>I</i>4/<i>m</i><i>m</i><i>m</i> phase compared to the ambient pressure orthorhombic <i>A</i><i>m</i><i>a</i><i>m</i> phase. Furthermore, by simulating random configurations of apical oxygen vacancies, we show that oxygen vacancies suppress both pairing strength and superfluid density. These results underscore the critical role of pressure and oxygen stoichiometry in tuning the SC of La<sub>3</sub>Ni<sub>2</sub>O<sub>7</sub>, providing key insights into optimizing its high-<i>T</i><sub><i>c</i></sub> behavior.</p>

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Impact of pressure and apical oxygen vacancies on superconductivity in La3Ni2O7

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月27日

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  • Chen Lu,
  • Ming Zhang,
  • Zhiming Pan,
  • Congjun Wu,
  • Fan Yang

摘要

The bilayer nickelate La3Ni2O7 under pressure has recently emerged as a promising system for high-Tc superconductivity. In this work, we investigate the fate of the superconducting properties in La3Ni2O7 under pressure, focusing on the effects of structural deformation and apical oxygen vacancies. Employing a low-energy effective t-J∥-J⊥ model for the \(3{d}_{{x}^{2}-{y}^{2}}\) 3 d x 2 − y 2 orbitals within the slave-boson mean-field approach, we demonstrate that the pairing strength is significantly enhanced in the high-pressure tetragonal I4/mmm phase compared to the ambient pressure orthorhombic Amam phase. Furthermore, by simulating random configurations of apical oxygen vacancies, we show that oxygen vacancies suppress both pairing strength and superfluid density. These results underscore the critical role of pressure and oxygen stoichiometry in tuning the SC of La3Ni2O7, providing key insights into optimizing its high-Tc behavior.