Interplay between hole superconductivity and quantum critical antiferromagnetic fluctuations in electron-doped cuprates.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40113780.
- Also identified by DOI 10.1038/s41467-025-57942-z and PMC identifier 11926391.
- Licence recorded as CC BY-NC-ND.
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Abstract
Antiferromagnetic spin fluctuations are the most promising candidate as the pairing glue of high critical temperature (T<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 T<sub>c</sub> and the quasiparticle weight of the incipient hole pocket near the nodal point in electron-doped Pr<sub>1-x</sub>LaCe<sub>x</sub>CuO<sub>4±δ</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.