Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconducting properties of (Ba-K)Fe2As2 single crystals disordered
  with fast neutron irradiation   Resistivity Rho(T), Hall coefficient RH(T), superconducting transition
temperature Tc and slopes of the upper critical field dHc2/dT were studied in
(Ba1-xKx)Fe2As2 (x = 0.218, 0.356, 0.531) single crystals irradiated with fast
neutrons. It is found that dTc/dRhoSC - the rate of decreasing Tc as a function
of the RhoSC (RHoSC is the resistivity at T = Tc) - linearly increases with
concentration x. Slow changes in the Hall coefficient RH, as well as the
quadratic electronic contribution to the resistivity, show that there are no
substantial changes in the topology of the Fermi surface caused by irradiation.
The slopes of the upper critical field dHc2/dT in ab- and c-directions as a
function of RHoSC determined by Hall measurements show a reasonable agreement
with a model that suggests constancy of the band parameters.

19
The categories of this paper are: eess
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: stat
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys