Abstract
It is conceivable that the high-T c superconducting perovskites are conventional electronphonon superconductors. In this case one expects significant strong-coupling effects because of the unusually high ratiok B T c /ħ〈ω〉 of the order 0.1 and greater. We use a set of reasonable models for the Eliashberg function α2 F(ω) (which takes into account available information on the phonon spectra and which fit the measuredT c 's) and calculate strong-coupling effects in the specific heatc s (T)/γT c , the ratio Δ0/k B T c , the critical fieldsH c (T) andH c2 (T) including Pauli limiting, and other measurable quantities. Strongcoupling corrections turn out to be in the range of 0 to about 100%, depending on the quantity of interest. We discuss the perspectives of using strong-coupling effects as indicators for conventional electron-phonon superconductivity in the new materials.
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Ashauer, B., Lee, W. & Rammer, J. Strong-coupling effects in high-T c superconductors. Z. Physik B - Condensed Matter 67, 147–154 (1987). https://doi.org/10.1007/BF01303974
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DOI: https://doi.org/10.1007/BF01303974