Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Induced Ferromagnetism and Colossal Magnetoresistance by Ir-Doping in
  Pr1-xCaxMnO3   The doping of the manganese site by iridium (up to 15%) in the small A cation
manganites Pr_{1-x}Ca_xMnO_3 (0.4 < x < 0.8), has been investigated as a new
method to suppress charge-ordering and induce CMR effects. Ir doping leads to
ferromagnetism and to insulator to metal transitions, with high transition
temperatures reaching 180K and CMR ratio in 7T as large as 10^4. The efficiency
with which iridium induces ferromagnetism and CMR is compared to previous
results obtained with other substitutions (Ru, Rh, Ni, Cr, ...). The ionic
radius of the foreign cations and their mixed-valencies are found to be the
main parameters governing the ability to collapse the charge-ordered state.

12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol