Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thickness dependence of the ground-state properties in thin films of the
  heavy-fermion compound CeCu_6   High-quality thin polycrystalline films of the heavy-fermion compound CeCu_6
were prepared by sputter deposition. The thicker of these films (with thickness
up to around 200 nm) reproduce the properties of the bulk compound CeCu_6. As
the thickness of the films is decreased, our measurements display strong
deviations from the bulk properties, namely, a suppression of the heavy-fermion
state. We show that possible `external' effects, like disorder, oxidation and
morphology can be excluded and that this size effect is therefore an intrinsic
property of CeCu_6. In addition, we investigate possible scenarios explaining
the size effect, and find that the proximity of CeCu_6 to a quantum phase
transition can account for this striking result.

33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an