Udomsamuthirun P. Effect of pseudogap on the isotope exponent of high-Tc superconductors. Physica Status Solidi (B) Basic Research. Vol 226, No.2 (2001), p.315-321. doi:10.1002/1521-3951(200108)226:2<315 Retrieved from: https://hdl.handle.net/20.500.14740/6860
The purpose of this paper is to explain the unusual isotope coefficients of cuprates by considering the influence of a pseudogap and phononic and electronic interactions in weak-coupling limit. Exact analytic expressions of the isotope exponent (α) for the s- and d-wave pairing symmetry are derived. It is found that α can fit the experimental data well and that the presence of the pseudogap increases α in the low-Tc region, but has no effect in the high-Tc region.
