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DOE OSTI · 2572400

Anisotropic electron damping and energy gap in Bi 2 ⁢Sr 2 ⁢CaCu 2 ⁢O 8+𝛿

Li, Jiemin [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)] (ORCID:0000000271536123)·Gu, Yanhong [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)]·Yamada, Takemi [Toyama Prefectural University, Imizu, Toyama (Japan)] (ORCID:0000000234195681)·Wu, Zebin [Brookhaven National Laboratory (BNL), Upton, NY (United States)]·Gu, Genda [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000298863255)·Valla, Tonica [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000232379102)·Drozdov, Ilya [Brookhaven National Laboratory (BNL), Upton, NY (United States)]·Božović, Ivan [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000164007461)·Dean, Mark P. M. [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000151393543)·Tohyama, Takami [Tokyo Univ. of Science (Japan)] (ORCID:0000000246797719)·Pelliciari, Jonathan [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)]·Bisogni, Valentina [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)] (ORCID:0000000273999930)
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Abstract

The many-body electron-electron interaction in cuprates causes broadening of the electronic bands in 𝒌 space, leading to a deviation from the standard Fermi liquid. While a 𝒌-dependent anisotropic electronic scattering (𝒌-DAES) has been assessed by photoemission, its fingerprint in 𝑸 space has been scarcely considered. Here, we explore the 𝑸-dependent electron dynamics in optimally doped Bi 2⁢ Sr 2 ⁢CaCu 2 ⁢O 8+𝛿 through the evolution of low-energy charge excitations as measured by resonant inelastic x-ray scattering (RIXS). In the normal state, the RIXS spectra display a continuum of excitations down to 0 meV, while the superconducting state features a spectral weight suppression below 80 meV without any enhancement at higher energies. To interpret the energy and 𝑸 evolution of our data, we introduce a phenomenological expression of the charge susceptibility by including the 𝒌-DAES. We show that only the charge susceptibility with 𝒌-DAES captures the RIXS data, highlighting the importance of 𝒌-DAES when describing the 𝑸 dependence of charge excitations from 0 to a few eV scale. Furthermore, we also find that the inclusion of 𝒌-DAES is essential when quantitative parameters such as the electronic energy gap are extracted from RIXS data.

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36 MATERIALS SCIENCECharge dynamicsResonant inelastic x-ray scatteringStrongly correlated systemsSuperconducting gapUnconventional superconductors

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Li, Jiemin [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)] (ORCID:0000000271536123), Gu, Yanhong [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)], Yamada, Takemi [Toyama Prefectural University, Imizu, Toyama (Japan)] (ORCID:0000000234195681), Wu, Zebin [Brookhaven National Laboratory (BNL), Upton, NY (United States)], Gu, Genda [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000298863255), Valla, Tonica [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000232379102), Drozdov, Ilya [Brookhaven National Laboratory (BNL), Upton, NY (United States)], Božović, Ivan [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000164007461), Dean, Mark P. M. [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000151393543), Tohyama, Takami [Tokyo Univ. of Science (Japan)] (ORCID:0000000246797719), Pelliciari, Jonathan [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)], Bisogni, Valentina [Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)] (ORCID:0000000273999930). 2025-06-27. Anisotropic electron damping and energy gap in Bi 2 ⁢Sr 2 ⁢CaCu 2 ⁢O 8+𝛿. https://doi.org/10.1103/k32g-pknp

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