Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of mixed alkali-element substitution on structural and magnetic
  properties of praseodymium manganites Pr0.9(Na1-xKx)0.1MnO3   The effect of cationic size mismatch at the A site at constant manganese
valence on the structural and magnetic properties of a perovskite-type
rare-earth manganate was investigated in the Pr0.9(Na1-xKx)0.1MnO3 solid
solution system (0 <= x < 1). All members of this solid solution series are
orthorhombic at room temperature, space group Pbnm. Structural refinements
using the Rietveld method show that the cell volume increases and the static
Jahn-Teller distortion decreases with increasing potassium content x. Magnetic
properties are characterized by strong positive \theta p values, and are
ascribed to a canted ferromagnetic arrangement. The high Curie constant values
in the paramagnetic regime can be explained by a magnetic cluster model of 2-3
Mn ions.

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The categories of this paper are: cs
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The categories of this paper are: stat
10
The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: math
36
The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc