Authors: Benedek, Giorgio; Manson, Joseph R.; Miret-Artes, Salvador; Schmicker, Detlef; Toennies, Jan Peter

Journal: CONDENSED MATTER

Publication date: 2024/12/01

DOI: 10.3390/condmat9040051

Abstract: 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 lambda, 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+delta at the optimal doping delta = 0.16 is lambda = 0.55 +/- 0.08 is in good agreement with values of lambda recently estimated with other methods. This also confirms the relevant role of electron-phonon interaction in high-temperature non-stoichiometric cuprate superconductors.