Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Isotope effect in the presence of a pseudogap   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.

33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
1
The categories of this paper are: cs
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn