Paramagnons and high-temperature superconductivity in mercury-based cuprates

ORAL

Abstract

High-temperature superconductivity in the cuprates is realized upon doping antiferromagnetic parent compounds, in which spin excitations have a bandwidth of a few hundred meV. At such high energies, paramagnons and two-magnon excitations are known to persist well into and beyond the superconducting doping range [1,2,3], but it remains unclear to what extent they contribute to Cooper pairing [4] or how the magnetic and superconducting energy scales are related to each other. We have used resonant inelastic photon (Raman, X-ray) scattering to study the first two members of the Hg-family of cuprates, HgBa2CuO4+d and HgBa2CaCu2O6+d, which have nearly identical crystal structure in the charge-reservoir layers but different electronic environment in the quintessential Cu-O layers. We find that the latter compound, which has higher Tc and larger superconducting gap, also has considerably higher magnetic excitation energies.
[1] Nat. Phys. 7, 725 (2011).
[2] Nat. Mater. 12, 1019 (2013).
[3] Phys. Rev. Lett. 111, 187001 (2013).
[4] Phys. Rev. Lett. 108, 227003 (2012).

*National Natural Science Foundation of China (NSFC, Grants No. 11888101, No. 11874069 and Grant No. 11974029);
Ministry of Science and Technology of China (MOST, Grant No. 2018YFA0305602 and Grant No. 2019YFA0308401).

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Presenters

  • Guanhong He

    • International Cent re for Quantum Materials, School of Physics, Peking University, Beijing, Peking Univ

Authors

  • Lichen Wang

    • International Cent re for Quantum Materials, School of Physics, Peking University, Beijing, Peking Univ

  • Guanhong He

    • International Cent re for Quantum Materials, School of Physics, Peking University, Beijing, Peking Univ

  • Zichen Yang

    • Solid State spectroscopy, Max Planck Institute for Solid State Research

  • Mirian Garcia-Fernnandez

    • Diamond Light Source
    • Diamond Light Source, UK
    • Diamond Light Source, Harwell Science & Innovation Campus

  • Abhishek Nag

    • Diamond Light Source
    • Diamond Light Source, Harwell Science & Innovation Campus

  • Ke-jin Zhou

    • Diamond Light Source
    • Diamond Light Source, UK
    • Diamond Light Source, Harwell Science & Innovation Campus

  • Matteo Minola

    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
    • Solid State spectroscopy, Max Planck Institute for Solid State Research

  • Matthieu Le Tacon

    • Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology
    • Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, Germany

  • Bernhard Keimer

    • Max Planck Inst for Solid State Research
    • Max-Planck-Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
    • Max Planck Institute for Solid State Physics
    • Max Planck Institute for Solid State Research
    • Solid State spectroscopy, Max Planck Institute for Solid State Research
    • Max Planck Institute for Solid State Research, Stuttgart, Germany

  • Yingying Peng

    • International Cent re for Quantum Materials, School of Physics, Peking University, Beijing, Peking Univ

  • Yuan Li

    • International Center for Quantum Materials, School of Physics, Peking University
    • Peking University
    • Peking Univ
    • International Cent re for Quantum Materials, School of Physics, Peking University, Beijing, Peking Univ