Isotope effect in the presence of a pseudogap
Superconductivity
2009-10-31 v1
Abstract
We investigate the question whether the unusual doping dependence of the isotope exponent observed in underdoped high-Tc superconductors might be related to another unusual phenomenon observed in these systems: the pseudogap phenomenon. Within different approximations we study the influence of a phenomenological pseudogap on the isotope exponent and find that it generally strongly increases the isotope exponent, in qualitative agreement with experiments on underdoped high-Tc compounds. This result is stable against strong-coupling self-energy corrections and also holds for recently proposed spinfluctuation exchange models, if a weak additional electron-phonon coupling is considered.
Cite
@article{arxiv.cond-mat/9911123,
title = {Isotope effect in the presence of a pseudogap},
author = {Thomas Dahm},
journal= {arXiv preprint arXiv:cond-mat/9911123},
year = {2009}
}
Comments
6 pages, 3 Postscript figures, submitted to Phys. Rev. B