Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The gap maximum of anisotropic superconductors   For a completely general anisotropic order parameter (including changes of
sign), we show that weak coupling theory is incompatible with high values of
the maximum \Delta_{M} of the zero temperature gap as compared to the critical
temperature T_{c}, such as those found experimentally in
Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta} where 2 \Delta_{M} / T_{c} \approx 7.5 . This
gives evidence for strong coupling effects. In particular this comes as a major
support for a spin fluctuation mechanism with strong coupling, if one assumes
that only a repulsive pairing interaction is at work in high T_{c}
superconductors.

27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th