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

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 () and C. Kim ()
Additional contact information
Dongjoon Song: University of British Columbia
Suheon Lee: Institute for Basic Science (IBS)
Zecheng Shen: Emory University
Woobin Jung: Institute for Basic Science (IBS)
Wonjun Lee: Institute for Basic Science (IBS)
Sungkyun Choi: Institute for Basic Science (IBS)
Wonshik Kyung: Institute for Basic Science (IBS)
Saegyeol Jung: Institute for Basic Science (IBS)
Cheng-Maw Cheng: National Synchrotron Radiation Research Center
Junyoung Kwon: Pohang University of Science and Technology
S. Ishida: National Institute of Advanced Industrial Science and Technology (AIST)
Y. Yoshida: National Institute of Advanced Industrial Science and Technology (AIST)
Seung Ryong Park: Incheon National University
H. Eisaki: National Institute of Advanced Industrial Science and Technology (AIST)
Yao Wang: Emory University
Kwang-Yong Choi: Sungkyunkwan University
C. Kim: Institute for Basic Science (IBS)

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract 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.

Date: 2025
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DOI: 10.1038/s41467-025-57942-z

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