Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductivity in MgB2 and TaB2: A Full-Potential Electronic
  Structure Comparison   We present a comparison of electronic structure of MgB2 and TaB2, the two new
superconductors, as well as VB2, calculated using full-potential, density-
functional-based methods in P6/mmm crystal structure. Our results, described in
terms of (i) density of states (DOS), (ii) band-structure, and (iii) the DOS
and the electronic charge density in a small energy window around the Fermi
energy EF. In particular, the charge density around EF in MgB2 and TaB2 show
striking similarity as far as the B plane is concerned. A comparison of their
band-structures, coupled with l-character analysis, indicates that TaB2 has
substantially more p-character than VB2 along A-L and H-A directions near EF.

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The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con