The Electron–Phonon Interaction in Non-Stoichiometric Bi2Sr2CaCu2O8+δ Superconductor Obtained from the Diffuse Elastic Scattering of Helium Atoms

Previously, helium atom scattering (HAS) has been shown to probe the electron–phonon interaction at conducting crystal surfaces via the temperature dependence of the specular peak intensity. This method is now extended to non-stoichiometric superconductors. The electron–phonon interaction, as expres...

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Bibliographic Details
Published in:Condensed matter 2024-11, Vol.9 (4), p.51
Main Authors: Benedek, Giorgio, Manson, Joseph R., Miret-Artés, Salvador, Schmicker, Detlef, Toennies, Jan Peter
Format: Article
Language:English
Subjects:
Atomic properties
Crystal surfaces
Elastic scattering
Electron phonon interactions
Electrons
Energy
HAS scattering
Helium atoms
High temperature
non-stoichiometric cuprates
Phonons
Spectrum analysis
Stoichiometry
Superconductivity
Superconductors
Temperature
Temperature dependence
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Summary:Previously, helium atom scattering (HAS) has been shown to probe the electron–phonon interaction at conducting crystal surfaces via the temperature dependence of the specular peak intensity. This method is now extended to non-stoichiometric superconductors. The electron–phonon interaction, as expressed by the mass-enhancement factor λ, is derived from the temperature dependence of the diffuse elastic scattering intensity, which specifically depends on the non-stoichiometric component responsible for superconductivity. The measured value of the mass-enhancement factor for Bi2Sr2CaCu2O8+δ at the optimal doping δ = 0.16 is λ = 0.55 ± 0.08 is in good agreement with values of λ recently estimated with other methods. This also confirms the relevant role of electron–phonon interaction in high-temperature non-stoichiometric cuprate superconductors.
ISSN:2410-3896
2410-3896
DOI:10.3390/condmat9040051