Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Classical Rotational Inertia and Nonclassical Supersolid
  Signals in Solid 4He below 250 mK   We have confirmed the existence, as first reported by Kim and Chan, of a
supersolid state in solid 4He at temperatures below 250 mK. We have employed a
torsional oscillator cell with a square cross section to insure a locking of
the solid to the oscillating cell. We find that NCRI signal is not a universal
property of solid 4He, but can be eliminated through an annealing of the solid
helium sample. This result has important implications for the nature of the
supersolid state.

22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph