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<p>Antiferromagnetic spin fluctuations are the most promising candidate as the pairing glue of high critical temperature (<i>T</i><sub>c</sub>) superconductivity in cuprates. However, many-body states and intertwined orders have made it difficult to determine how electrons couple with fluctuating spins to form Cooper pairs. Recent experimental and theoretical studies have suggested spin fluctuation-driven quasiparticle band folding, but the relationship between the resultant Fermi pockets and superconductivity remains unclear. Here, using angle-resolved photoemission spectroscopy and numerical simulations, we show a proportional relationship between <i>T</i><sub>c</sub> and the quasiparticle weight of the incipient hole pocket near the nodal point in electron-doped Pr<sub>1−<i>x</i></sub>LaCe<sub><i>x</i></sub>CuO<sub>4±<i>δ</i></sub>. Through complementary muon spin spectroscopy measurements, we uncover that the hole pocket forms only in the regime of the fluctuating antiferromagnetic ground state around a presumed quantum critical point. Our observations highlight the significance of the electron-spin fluctuation interaction in enhancing the hole pocket and consequently driving superconductivity.</p>

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Interplay between hole superconductivity and quantum critical antiferromagnetic fluctuations in electron-doped cuprates

  • 期刊论文

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  • 发表日期：

    2025年3月20日

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  • Dongjoon Song,
  • Suheon Lee,
  • Zecheng Shen,
  • Woobin Jung,
  • Wonjun Lee,
  • Sungkyun Choi,
  • Wonshik Kyung,
  • Saegyeol Jung,
  • Cheng-Maw Cheng,
  • Junyoung Kwon,
  • S. Ishida,
  • Y. Yoshida,
  • Seung Ryong Park,
  • H. Eisaki,
  • Yao Wang,
  • Kwang-Yong Choi,
  • C. Kim

摘要

Antiferromagnetic spin fluctuations are the most promising candidate as the pairing glue of high critical temperature (Tc) superconductivity in cuprates. However, many-body states and intertwined orders have made it difficult to determine how electrons couple with fluctuating spins to form Cooper pairs. Recent experimental and theoretical studies have suggested spin fluctuation-driven quasiparticle band folding, but the relationship between the resultant Fermi pockets and superconductivity remains unclear. Here, using angle-resolved photoemission spectroscopy and numerical simulations, we show a proportional relationship between Tc and the quasiparticle weight of the incipient hole pocket near the nodal point in electron-doped Pr1−xLaCexCuO4±δ. Through complementary muon spin spectroscopy measurements, we uncover that the hole pocket forms only in the regime of the fluctuating antiferromagnetic ground state around a presumed quantum critical point. Our observations highlight the significance of the electron-spin fluctuation interaction in enhancing the hole pocket and consequently driving superconductivity.