Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Iron superhydrides FeH5 and FeH6: stability, electronic properties and
  superconductivity   Recently a big number of works devoted to search for new hydrides with record
high-temperature superconductivity and at the same time the successful
synthesis of potential high-TC superconducting FeH5 was reported. We present a
systematic search for stable compounds in the Fe-H system using
variable-composition version of the evolutionary algorithm USPEX. All known
(FeH, FeH3, FeH5) and several new Fe3H5, Fe3H13 and FeH6 iron hydrides were
found to be stable, resulting in a very complex phase diagram with rich
structural relationships between phases. We calculate electronic properties of
two potentially high-TC FeH5 and FeH6 phases in the pressure range from 150 to
300 GPa. Indeed, hydrogen-rich FeH5 and FeH6 phases were found to be
superconducting within Bardeen-Cooper-Schrieffer theory, with TC values of up
to 46 K.

14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph