Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Breakdown by a magnetic field of the superconducting fluctuations in the
  normal state in Pb_{1-x}In_x alloys   The effects induced on the magnetization by coherent fluctuating Cooper pairs
in the normal state have been measured in Pb_{1-x}In_x alloys up to high
magnetic fields, of amplitudes above Hc2(0), the upper critical field
extrapolated to T=0K. Our results show that in dirty alloys these
superconducting fluctuation effects are, in the entire H-T phase diagram above
Hc2(T), independent of the amount of impurities and that they vanish when
H~1.1Hc2(0). These striking results are consistent with a phenomenological
estimate that takes into account the limits imposed by the uncertainty
principle to the shrinkage, when H increases, of the superconducting wave
function.

34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math