Transition temperature and isotope effect near an extended van Hove singularity |
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Authors: | Roland Zeyher |
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Institution: | (1) Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany |
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Abstract: | Using Eliashberg theory and a model density for 2
F the transition temperatureT
c
and the isotope effect are calculated near an extended van Hove singularity. We show that, at least in the one-particle and the Migdal approximation, even the considered strong van Hove singularity cannot yield large enhancements ofT
c
and strong reductions of of the kind observed in experiment around optimal doping. |
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Keywords: | 74 20 -z 74 65 +n 74 70 Vy |
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