Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical exponents at the ferromagnetic transition in
  tetrakis(diethylamino)ethylene-C$_{60}$ (TDAE-C$_{60}$)   Critical exponents at the ferromagnetic transition were measured for the
first time in an organic ferromagnetic material tetrakis(dimethylamino)ethylene
fullerene[60] (TDAE-C$_{60}$). From a complete magnetization-temperature-field
data set near $T_{c}=16.1\pm 0.05,$ we determine the susceptibility and
magnetization critical exponents $\gamma =1.22\pm 0.02$ and $\beta =0.75 \pm
0.03$ respectively, and the field vs. magnetization exponent at $T_{c}$ of
$\delta =2.28\pm 0.14$. Hyperscaling is found to be violated by $\Omega \equiv
d^{\prime}-d \approx -1/4$, suggesting that the onset of ferromagnetism can be
related to percolation of a particular contact configuration of C$_{60}$
molecular orientations.

19
The categories of this paper are: eess
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ