Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Electrostriction of a Granular Superconductor   Zero-temperature field-induced polarization, supercurrent density, and the
related electrostriction (ES) of a granular superconductor are calculated
within a model of 3D Josephson junction arrays. Both the "bulk-modulus-driven
ES" (the change of the sample's volume in the free energy upon the applied
stress) and the "change-of-phase ES" (due to the stress dependence of the
weak-links-induced polarization) are considered. In contrast to
magnetostriction of a granular superconductor, its electroelastic behavior is
predicted to be dominated by the former contribution for all applied fields.

37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
16
The categories of this paper are: stat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys