Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of magnetic field on over-doped HTc superconductors: Conflicting
  predictions of various HTc theories   Following the recent NMR experiments by Gorny et al., we discuss the effect
of a magnetic field on the superconducting T_c and the spin pseudo-gap T^*. As
a testable prediction, we argue that a spin pseudo-gap should also be observed
in over-doped samples in a magnetic fied (while normally there is no pseudo-gap
above T_c). We find that different theoretical approaches have marked
differences in their predictions for over-doped HTc cuprates.

32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con