Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental control of Tc in AlB2-type compounds using an applied
  voltage   We utilize the van de Pauw technique combined with Density Functional Theory
to show that an external voltage applied to superconducting AlB2-type
compounds, such as MgB2 and Mg(B1.9C0.1), effects substantive changes in
transition temperature due to modification of electronic band structure. An
applied voltage results in a symmetric split of degenerate sigma bands in MgB2
similar to that calculated for atom displacement along the B-B bond aligned
with E2g phonon mode directions. For AlB2, similar splitting of sigma bands
occurs albeit with higher voltage requirement compared to MgB2. Experimental
data show that Tc values for MgB2 and Mg(B1.9C0.1) reduce consistently with
increased increments of applied voltage. Zero resistance is limited by an upper
applied voltage depending on the compound.

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The categories of this paper are: bayes-an
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci