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  • Letter
  • Open Access

Dual origin in the temperature dependence of the coupling parameter for the strange metal state in heavily overdoped cuprate superconductor

Yudai Miyai1,*, Shin-ichiro Ideta2, Masashi Arita2, Kiyohisa Tanaka3, Migaku Oda4, Tohru Kurosawa5,†, and Kenya Shimada2,6,7,‡

  • *Contact author: d220057@hiroshima-u.ac.jp
  • †Contact author: kurosawa@mmm.muroran-it.ac.jp
  • ‡Contact author: kshimada@hiroshima-u.ac.jp
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Phys. Rev. Research 7, L012039 – Published 24 February, 2025

DOI: https://doi.org/10.1103/PhysRevResearch.7.L012039

Abstract

The real and imaginary parts of the self-energy in the wide energy range have been evaluated from high-resolution angle-resolved photoemission spectroscopy (ARPES) spectra of a heavily overdoped single-layer cuprate superconductor (Bi,Pb)2Sr2CuO6+δ in the normal state. The real part of the self-energy has the zero-point crossing at −0.6 eV, where the lifetime broadening takes maximum and the ARPES spectral intensity is significantly suppressed forming a high-energy anomaly (HEA). The self-energy part responsible for the HEA is almost temperature independent and the coupling parameter is λHEA∼1 at 300 K, indicating strongly correlated nature of the strange metal state. Meanwhile, the self-energy part responsible for the low-energy kink (LEK) near the Fermi level shows significant temperature dependence: it is λLEK∼0.1 at 300 K but enhances steeply below ∼150K up to λLEK∼0.8, leading to the total coupling strength of λtot=λHEA+λLEK=1.8 at 20 K. The temperature-dependent enhancement cannot be explained by the electron-phonon interaction with a fixed magnitude of the Eliashberg function, which suggests an unexplored mechanism that enhances the coupling parameter at lower temperatures. Our results clearly indicate distinct energy scales in the self-energy, providing insight into the strange metal state as well as the temperature-dependent interplay of many-body interactions.

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Phys. Rev. Research 7, L012039– Published 24 February, 2025
  • Received 16 June 2024
  • Accepted 2 December 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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