Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nearly Singular Magnetic Fluctuations in the Normal State of a High-T_c
  Cuprate Superconductor   Polarized and unpolarized neutron scattering was used to measure the wave
vector- and frequency-dependent magnetic fluctuations in the normal state (from
the superconducting transition temperature, T_c=35, up to 350 K) of single
crystals of La_{1.86}Sr_{0.14}CuO_4. The peaks which dominate the fluctuations
have amplitudes that decrease as T^{-2} and widths that increase in proportion
to the thermal energy, k_B T (where k_B is Boltzmann's constant), and energy
transfer added in quadrature. The nearly singular fluctuations are consistent
with a nearby quantum critical point.

30
The categories of this paper are: q-alg
2
The categories of this paper are: math
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol