Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Softening and Broadening of the Zone Boundary Magnons in
  Pr0.63Sr0.37MnO3   We have studied the spin dynamics in Pr$_{0.63}$Sr$_{0.37}$MnO$_3$ above and
below the Curie temperature $T_C=301$ K. Three distinct new features have been
observed: a softening of the magnon dispersion at the zone boundary for
$T<T_C$, significant broadening of the zone boundary magnons as $T\to T_C$, and
no evidence for residual spin-wave like excitations just above $T_C$. The
results are inconsistent with double exchange models that have been
successfully applied to higher $T_C$ samples, indicating an evolution of the
spin system with decreasing $T_C$.

18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio