Abstract
It is shown that the long-range part of the electron-phonon coupling (rigidly displaced ionic potentials screened by a background dielectric constant ε∞ and by holes moving along the CuO2 planes) is large in YBa2Cu3O7 due to imperfect screening. Using a simple phenomenological model for the phonon part the long-range contribution to the Eliashberg function α2 F(ω) is evaluated yielding a value of about 2.4 for λ. The calculation suggests that this long-range part which is neglegible in usual metals plays an important role in high-T c oxides.
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Zeyher, R. Improtance of long-range electron-phonon coupling in high-T c superconductors. Z. Physik B - Condensed Matter 80, 187–192 (1990). https://doi.org/10.1007/BF01357501
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DOI: https://doi.org/10.1007/BF01357501