Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High T$_c$ superconductivity in superhard diamond-like BC$_{5}$   Using density functional theory calculations we show that the
recently-synthesized, superhard diamond-like BC$_5$ is superconducting with a
critical temperature of the same order than that of MgB$_2$. The average
electron-phonon coupling is $\lambda=0.89$, the phonon-frequency
logarithmic-average is $<\omega >_{\log}=67.4 $ meV and the isotope
coefficients are $\alpha(C)=0.3$ and $\alpha(B)=0.2$. In BC$_5$,
superconductivity is mostly sustained by vibrations of the B atom and its C
neighbors.

24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin