Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of spin-wave excitations in ferromagnetic metallic manganites   Neutron scattering results are presented for spin-wave excitations of three
ferromagnetic metallic $A_{1-x}A^{\prime}_{x}$MnO$_3$ manganites (where $A$ and
$A^\prime$ are rare- and alkaline-earth ions), which when combined with
previous work elucidate systematics of the interactions as a function of
carrier concentration $x$, on-site disorder, and strength of the lattice
distortion. The long wavelength spin dynamics show only a very weak dependence
across the series. The ratio of fourth to first neighbor exchange ($J_4/J_1$)
that controls the zone boundary magnon softening changes systematically with
$x$, but does not depend on the other parameters. None of the prevailing models
can account for these behaviors.

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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys