Isotope effect in the presence of a pseudogap

Details Isotope effect in the presence of a pseudogap Isotope effect in the presence of a pseudogap

1999-11-09

arxiv.org/abs/cond-mat/9911123v1

Phys. Rev. B 61, 6381 (2000)

Physics

Condensed Matter

Superconductivity

6 pages, 3 Postscript figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.61.6381

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.

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