Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inelastic neutron scattering study of magnetic excitations in
  Sr$_2$RuO$_4$   Magnetic excitations in \srruo ~ have been studied by inelastic neutron
scattering. The magnetic fluctuations are dominated by incommensurate peaks
related to the Fermi surface nesting of the quasi-one-dimensional $d_{xz}$- and
$d_{yz}$-bands. The shape of the incommensurate signal agrees well with RPA
calculations. At the incommensurate {\bf Q}-positions the energy spectrum
considerably softens upon cooling pointing to a close magnetic instability :
\srruo ~does not exhibit quantum criticality but is very close to it. $\omega /
T$-scaling may be fitted to the data for temperatures above 30 K. Below the
superconducting transition, the magnetic response at the nesting signal is not
found to change in the energy range down to 0.4meV.

11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th