Scholarlink

<p>Optimization of unconventional superconductivity involves a balance of interaction strengths. Precise determination of correlation strength across different material families is therefore important. Here, we present a combined X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) study of infinite-layer PrNiO<sub>2</sub> and SrCuO<sub>2</sub> that enables fair comparison of their interaction strengths. For both compounds, we study the orbital and magnetic excitations and extract their dispersions along high-symmetry directions. Using a single-band Hubbard model and including physically plausible assumptions about higher-order exchange interactions, we estimate the correlation factor <i>U</i>/<i>t</i> for both compounds. A key finding is that despite the prediction of a smaller Coulomb repulsion <i>U</i>, PrNiO<sub>2</sub> exhibits a correlation strength <i>U</i>/<i>t</i> that is 20% stronger than that of its isostructural cuprate counterpart SrCuO<sub>2</sub>. This indicates that moderation of the correlation strength may further optimize superconductivity in nickelates.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Impact of electron correlations on infinite-layer cuprates and nickelates

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月7日

查看全文
  • Xunyang Hong,
  • Yuetong Wu,
  • Izabela Biało,
  • Ying Chan,
  • Sze Tung Li,
  • Leonardo Martinelli,
  • Orion Gerguri,
  • Annabella Drewanowski,
  • Qiang Gao,
  • Xiaolin Ren,
  • Xingjiang Zhou,
  • Zhihai Zhu,
  • Alice Galdi,
  • Darrell G. Schlom,
  • Kyle M. Shen,
  • Jaewon Choi,
  • Mirian Garcia-Fernandez,
  • Ke-Jin Zhou,
  • Nicholas B. Brookes,
  • Henrik M. Rønnow,
  • Qisi Wang,
  • Johan Chang

摘要

Optimization of unconventional superconductivity involves a balance of interaction strengths. Precise determination of correlation strength across different material families is therefore important. Here, we present a combined X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) study of infinite-layer PrNiO2 and SrCuO2 that enables fair comparison of their interaction strengths. For both compounds, we study the orbital and magnetic excitations and extract their dispersions along high-symmetry directions. Using a single-band Hubbard model and including physically plausible assumptions about higher-order exchange interactions, we estimate the correlation factor U/t for both compounds. A key finding is that despite the prediction of a smaller Coulomb repulsion U, PrNiO2 exhibits a correlation strength U/t that is 20% stronger than that of its isostructural cuprate counterpart SrCuO2. This indicates that moderation of the correlation strength may further optimize superconductivity in nickelates.